""" This script was written for CASA 5.1.1 Datasets calibrated (in order of date observed): SB1: 2016.1.00484.L Observed 14 May 2017 and 17 May 2017 (2 execution blocks) LB1: 2016.1.00484.L Observed 24 September 2017 and 25 November 2017 (2 execution blocks) reducer: A. Isella """ """ Starting matter """ import os execfile('reduction_utils.py') skip_plots = True # if True, can run script non-interactively """ Input for loading data """ prefix = 'MYLup' SB1_path = '/full_path/to_calibrated/msfile.ms' LB1_path = '/full_path/to_calibrated/msfile.ms' # Note that if you are downloading data from the archive, your SPW numbering # may differ from this script, depending on how you split your data out! data_params = {'SB1': {'vis' : SB1_path, 'name' : 'SB1', 'field': 'MY_Lup', 'line_spws': np.array([0, 4]), # CO SPWs 'line_freqs': np.array([2.30538e11, 2.30538e11]), }, 'LB1': {'vis' : LB1_path, 'name' : 'LB1', 'field' : 'MY_Lupi', 'line_spws': np.array([3,7]), # CO SPWs 'line_freqs': np.array([2.30538e11, 2.30538e11]), } } """ Check data (various options here; an example) """ if not skip_plots: for i in data_params.keys(): plotms(vis=data_params[i]['vis'], xaxis='channel', yaxis='amplitude', field=data_params[i]['field'], ydatacolumn='data', avgtime='1e8', avgscan=True, avgbaseline=True, iteraxis='spw') """ Identify 50 km/s-wide region containing CO emission; then flag that and do a spectral average to a pseudo-continuum MS """ for i in data_params.keys(): flagchannels_string = get_flagchannels(data_params[i], prefix, velocity_range=np.array([-15, 25])) avg_cont(data_params[i], prefix, flagchannels=flagchannels_string) """ Define simple masks and clean scales for imaging """ mask_pa = 59 # position angle of mask in degrees mask_maj = 1.0 # semimajor axis of mask in arcsec mask_min = 0.6 # semiminor axis of mask in arcsec mask_ra = '16h00m44.50s' mask_dec = '-41.55.31.34' SB1_mask = 'ellipse[[%s, %s], [%.1farcsec, %.1farcsec], %.1fdeg]' % \ (mask_ra, mask_dec, mask_maj, mask_min, mask_pa) LB1_mask = 'ellipse[[%s, %s], [%.1farcsec, %.1farcsec], %.1fdeg]' % \ (mask_ra, mask_dec, mask_maj, mask_min, mask_pa) SB_scales = [0, 5, 10] LB_scales = [0, 10, 30, 90, 270] if not skip_plots: """ Image each dataset individually """ # images are saved in the format prefix+'_name_initcont_exec#.ms' image_each_obs(data_params['SB1'], prefix, mask=SB1_mask, scales=SB_scales, threshold='0.15mJy', interactive=False) image_each_obs(data_params['LB1'], prefix, mask=LB1_mask, scales=LB_scales, threshold='0.06mJy', interactive=False) """ Fit Gaussians to roughly estimate centers, inclinations, PAs """ fit_gaussian(prefix+'_SB1_initcont_exec0.image', region=SB1_mask) #Peak : ICRS 16h00m44.502359s -41d55m31.32430s fit_gaussian(prefix+'_SB1_initcont_exec1.image', region=SB1_mask) #Peak : ICRS 16h00m44.498646s -41d55m31.34984s fit_gaussian(prefix+'_LB1_initcont_exec0.image', region=LB1_mask) #Peak : ICRS 16h00m44.500993s -41d55m31.33852s #PA of Gaussian component: 58.89 deg #Inclination of Gaussian component: 73.24 deg fit_gaussian(prefix+'_LB1_initcont_exec1.image', region=LB1_mask) #Peak : ICRS 16h00m44.501227s -41d55m31.34468s #PA of Gaussian component: 59.07 deg #Inclination of Gaussian component: 73.37 deg """ The emission appears to be aligned; all phase centers are the same. """ """ Split out individual MSs for each execution """ split_all_obs(prefix+'_SB1_initcont.ms', prefix+'_SB1_initcont_exec') split_all_obs(prefix+'_LB1_initcont.ms', prefix+'_LB1_initcont_exec') """ Inspect the flux calibration. """ if not skip_plots: """ Assign rough emission geometry parameters and centers. """ PA, incl = 59, 73 phasecenter = au.radec2deg('16:00:44.510, -041:55:31.413') peakpos = au.radec2deg('16:00:44.50131, -041:55:31.324341') offsets = au.angularSeparation(peakpos[0], peakpos[1], phasecenter[0], phasecenter[1], True) offx, offy = 3600.*offsets[3], 3600.*offsets[2] """ Export MS contents into Numpy save files """ for msfile in [prefix+'_SB1_initcont_exec0.ms', prefix+'_SB1_initcont_exec1.ms', prefix+'_LB1_initcont_exec0.ms', prefix+'_LB1_initcont_exec1.ms']: export_MS(msfile) """ Plot deprojected visibility profiles for all data together """ plot_deprojected([prefix+'_SB1_initcont_exec0.vis.npz', prefix+'_SB1_initcont_exec1.vis.npz', prefix+'_LB1_initcont_exec0.vis.npz', prefix+'_LB1_initcont_exec1.vis.npz'], fluxscale=[1.0, 1.0, 1.0, 1.0], PA=PA, incl=incl, offx=offx, offy=offy, show_err=False) # Some offsets for LB data; check how much. """ Now inspect offsets by comparing against a reference """ estimate_flux_scale(reference=prefix+'_SB1_initcont_exec0.vis.npz', comparison=prefix+'_LB1_initcont_exec0.vis.npz', incl=incl, PA=PA) #The ratio of comparison : reference is 1.10652 #The scaling factor for gencal is 1.052 for your comparison measurement estimate_flux_scale(reference=prefix+'_SB1_initcont_exec0.vis.npz', comparison=prefix+'_LB1_initcont_exec1.vis.npz', incl=incl, PA=PA) #The ratio of comparison : reference is 0.83530 #The scaling factor for gencal is 0.914 for your comparison measurement """ The 2nd LB execution offset is a problem; this calibrator is found to be an issue in other DSHARP datasets. """ """ Correct the flux scales where appropriate. """ rescale_flux(prefix+'_LB1_initcont_exec0.ms', [1.052]) rescale_flux(prefix+'_LB1_initcont_exec1.ms', [0.914]) """ SELF-CAL for short-baseline data """ """ Merge the SB executions back into a single MS """ SB_cont_p0 = prefix+'_SB_contp0' os.system('rm -rf %s*' % SB_cont_p0) concat(vis=[prefix+'_SB1_initcont_exec0.ms', prefix+'_SB1_initcont_exec1.ms'], concatvis=SB_cont_p0+'.ms', dirtol='0.1arcsec', copypointing=False) """ Set up a clean mask """ common_mask = LB1_mask """ Initial clean """ tclean_wrapper(vis=SB_cont_p0+'.ms', imagename=SB_cont_p0, mask=common_mask, scales=SB_scales, threshold='0.15mJy', savemodel='modelcolumn') """ Define a noise annulus, measure the peak SNR in map """ noise_annulus = "annulus[[%s, %s],['%.2farcsec', '4.25arcsec']]" % \ (mask_ra, mask_dec, 1.1*mask_maj) estimate_SNR(SB_cont_p0+'.image', disk_mask=common_mask, noise_mask=noise_annulus) #MYLup_SB_contp0.image #Beam 0.276 arcsec x 0.235 arcsec (-78.60 deg) #Flux inside disk mask: 76.81 mJy #Peak intensity of source: 24.94 mJy/beam #rms: 8.04e-02 mJy/beam #Peak SNR: 310.10 """ Self-calibration parameters """ SB_contspws = '0~7' SB_refant = 'DA49@A002,DA59@A001' SB1_obs0_timerange = '2017/05/13/00~2017/05/15/00' SB1_obs1_timerange = '2017/05/16/00~2017/05/18/00' """ First round of phase-only self-cal (short baselines only) """ SB_p1 = prefix+'_SB.p1' os.system('rm -rf '+SB_p1) gaincal(vis=SB_cont_p0+'.ms', caltable=SB_p1, gaintype='T', spw=SB_contspws, refant=SB_refant, calmode='p', solint='30s', minsnr=1.5, minblperant=4) if not skip_plots: """ Inspect gain tables """ plotcal(caltable=SB_p1, xaxis='time', yaxis='phase',subplot=441, iteration='antenna', timerange=SB1_obs0_timerange, plotrange=[0,0,-180,180]) plotcal(caltable=SB_p1, xaxis='time', yaxis='phase',subplot=441, iteration='antenna', timerange=SB1_obs1_timerange, plotrange=[0,0,-180,180]) """ Apply the solutions """ applycal(vis=SB_cont_p0+'.ms', spw=SB_contspws, gaintable=[SB_p1], interp='linearPD', calwt=True) """ Split off a corrected MS """ SB_cont_p1 = prefix+'_SB_contp1' os.system('rm -rf %s*' % SB_cont_p1) split(vis=SB_cont_p0+'.ms', outputvis=SB_cont_p1+'.ms', datacolumn='corrected') """ Image the results; check the resulting map """ tclean_wrapper(vis=SB_cont_p1+'.ms', imagename=SB_cont_p1, mask=common_mask, scales=SB_scales, threshold='0.1mJy', savemodel='modelcolumn') estimate_SNR(SB_cont_p1+'.image', disk_mask=common_mask, noise_mask=noise_annulus) #MYLup_SB_contp1.image #Beam 0.276 arcsec x 0.235 arcsec (-78.97 deg) #Flux inside disk mask: 77.74 mJy #Peak intensity of source: 26.81 mJy/beam #rms: 3.78e-02 mJy/beam #Peak SNR: 709.39 """ Second round of phase-only self-cal (short baselines only) """ SB_p2 = prefix+'_SB.p2' os.system('rm -rf '+SB_p2) gaincal(vis=SB_cont_p1+'.ms', caltable=SB_p2, gaintype='T', spw=SB_contspws, refant=SB_refant, calmode='p', solint='18s', minsnr=1.5, minblperant=4) if not skip_plots: """ Inspect gain tables """ plotcal(caltable=SB_p2, xaxis='time', yaxis='phase', subplot=441, iteration='antenna', timerange=SB1_obs0_timerange, plotrange=[0,0,-180,180]) plotcal(caltable=SB_p2, xaxis='time', yaxis='phase', subplot=441, iteration='antenna', timerange=SB1_obs1_timerange, plotrange=[0,0,-180,180]) """ Apply the solutions """ applycal(vis=SB_cont_p1+'.ms', spw=SB_contspws, gaintable=[SB_p2], interp='linearPD', calwt=True) """ Split off a corrected MS """ SB_cont_p2 = prefix+'_SB_contp2' os.system('rm -rf %s*' % SB_cont_p2) split(vis=SB_cont_p1+'.ms', outputvis=SB_cont_p2+'.ms', datacolumn='corrected') """ Image the results; check the resulting map """ tclean_wrapper(vis=SB_cont_p2+'.ms', imagename=SB_cont_p2, mask=common_mask, scales=SB_scales, threshold='0.07mJy', savemodel='modelcolumn') estimate_SNR(SB_cont_p2+'.image', disk_mask=common_mask, noise_mask=noise_annulus) #MYLup_SB_contp2.image #Beam 0.278 arcsec x 0.237 arcsec (-81.99 deg) #Flux inside disk mask: 77.93 mJy #Peak intensity of source: 27.28 mJy/beam #rms: 3.80e-02 mJy/beam #Peak SNR: 717.15 """ Amplitude self-cal (short baselines only) """ SB_ap = prefix+'_SB.ap' os.system('rm -rf '+SB_ap) gaincal(vis=SB_cont_p2+'.ms', caltable=SB_ap, gaintype='T', spw=SB_contspws, refant=SB_refant, calmode='ap', solint='inf', minsnr=3.0, minblperant=4, solnorm=False) if not skip_plots: """ Inspect gain tables """ plotcal(caltable=SB_ap, xaxis='time', yaxis='amp', subplot=441, iteration='antenna', timerange=SB1_obs0_timerange, plotrange=[0,0,0,2]) plotcal(caltable=SB_ap, xaxis='time', yaxis='amp', subplot=441, iteration='antenna', timerange=SB1_obs1_timerange, plotrange=[0,0,0,2]) """ Apply the solutions """ applycal(vis=SB_cont_p2+'.ms', spw=SB_contspws, gaintable=[SB_ap], interp='linearPD', calwt=True) """ Split off a corrected MS """ SB_cont_ap = prefix+'_SB_contap' os.system('rm -rf %s*' % SB_cont_ap) split(vis=SB_cont_p2+'.ms', outputvis=SB_cont_ap+'.ms', datacolumn='corrected') """ Image the results; check the resulting map """ tclean_wrapper(vis=SB_cont_ap+'.ms', imagename=SB_cont_ap, mask=common_mask, scales=SB_scales, threshold='0.07mJy', savemodel='modelcolumn') estimate_SNR(SB_cont_ap+'.image', disk_mask=common_mask, noise_mask=noise_annulus) #MYLup_SB_contap.image #Beam 0.279 arcsec x 0.237 arcsec (-81.68 deg) #Flux inside disk mask: 77.66 mJy #Peak intensity of source: 27.39 mJy/beam #rms: 3.32e-02 mJy/beam #Peak SNR: 823.92 """ SELF-CAL for the combined (short-baseline + long-baseline) data """ """ Merge the SB+LB executions into a single MS """ combined_cont_p0 = prefix+'_combined_contp0' os.system('rm -rf %s*' % combined_cont_p0) concat(vis=[SB_cont_ap+'.ms', prefix+'_LB1_initcont_exec0_rescaled.ms', prefix+'_LB1_initcont_exec1_rescaled.ms'], concatvis=combined_cont_p0+'.ms', dirtol='0.1arcsec', copypointing=False) """ Initial clean """ tclean_wrapper(vis=combined_cont_p0+'.ms', imagename=combined_cont_p0, mask=common_mask, scales=LB_scales, threshold='0.1mJy', uvtaper=['0.04arcsec'], savemodel='modelcolumn') estimate_SNR(combined_cont_p0+'.image', disk_mask=common_mask, noise_mask=noise_annulus) #MYLup_combined_contp0.image #Beam 0.072 arcsec x 0.057 arcsec (74.79 deg) #Flux inside disk mask: 78.06 mJy #Peak intensity of source: 3.36 mJy/beam #rms: 1.51e-02 mJy/beam #Peak SNR: 222.69 """ Self-calibration parameters """ combined_contspws = '0~15' combined_refant = 'DA49@A002,DA59@A001,DV24@A090,DV08@A042' combined_spwmap = [0,0,0,0,4,4,4,4,8,8,8,8,12,12,12,12] LB1_obs0_timerange = '2017/09/23/00~2017/09/26/00' LB2_obs1_timerange = '2017/11/24/00~2017/11/27/00' """ First round of phase-only self-cal (all data) """ combined_p1 = prefix+'_combined.p1' os.system('rm -rf '+combined_p1) gaincal(vis=combined_cont_p0+'.ms', caltable=combined_p1, gaintype='T', combine='spw,scan', spw=combined_contspws, refant=combined_refant, calmode='p', solint='900s', minsnr=1.5, minblperant=4) if not skip_plots: """ Inspect gain tables """ plotcal(caltable=combined_p1, xaxis='time', yaxis='phase', subplot=441, iteration='antenna', timerange=LB1_obs0_timerange, plotrange=[0,0,-180,180]) plotcal(caltable=combined_p1, xaxis='time', yaxis='phase', subplot=441, iteration='antenna', timerange=LB2_obs1_timerange, plotrange=[0,0,-180,180]) """ Apply the solutions """ applycal(vis=combined_cont_p0+'.ms', spw=combined_contspws, spwmap=combined_spwmap, gaintable=[combined_p1], interp='linearPD', calwt=True, applymode='calonly') """ Split off a corrected MS """ combined_cont_p1 = prefix+'_combined_contp1' os.system('rm -rf %s*' % combined_cont_p1) split(vis=combined_cont_p0+'.ms', outputvis=combined_cont_p1+'.ms', datacolumn='corrected') """ Image the results; check the resulting map """ tclean_wrapper(vis=combined_cont_p1+'.ms', imagename=combined_cont_p1, mask=common_mask, scales=LB_scales, threshold='0.1mJy', uvtaper=['0.04arcsec'], savemodel='modelcolumn') estimate_SNR(combined_cont_p1+'.image', disk_mask=common_mask, noise_mask=noise_annulus) #MYLup_combined_contp1.image #Beam 0.072 arcsec x 0.057 arcsec (74.79 deg) #Flux inside disk mask: 78.01 mJy #Peak intensity of source: 3.32 mJy/beam #rms: 1.51e-02 mJy/beam #Peak SNR: 220.43 """ Second round of phase-only self-cal (all data) """ combined_p2 = prefix+'_combined.p2' os.system('rm -rf '+combined_p2) gaincal(vis=combined_cont_p1+'.ms', caltable=combined_p2, gaintype='T', combine='spw,scan', spw=combined_contspws, refant=combined_refant, calmode='p', solint='360s', minsnr=1.5, minblperant=4) if not skip_plots: """ Inspect gain tables """ plotcal(caltable=combined_p2, xaxis='time', yaxis='phase', subplot=441, iteration='antenna', timerange=LB1_obs0_timerange, plotrange=[0,0,-180,180]) plotcal(caltable=combined_p2, xaxis='time', yaxis='phase', subplot=441, iteration='antenna', timerange=LB2_obs1_timerange, plotrange=[0,0,-180,180]) """ Apply the solutions """ applycal(vis=combined_cont_p1+'.ms', spw=combined_contspws, spwmap=combined_spwmap, gaintable=[combined_p2], interp='linearPD', calwt=True, applymode='calonly') """ Split off a corrected MS """ combined_cont_p2 = prefix+'_combined_contp2' os.system('rm -rf %s*' % combined_cont_p2) split(vis=combined_cont_p1+'.ms', outputvis=combined_cont_p2+'.ms', datacolumn='corrected') """ Image the results; check the resulting map """ tclean_wrapper(vis=combined_cont_p2+'.ms', imagename=combined_cont_p2, mask=common_mask, scales=LB_scales, threshold='0.05mJy', uvtaper=['0.04arcsec'], savemodel='modelcolumn') estimate_SNR(combined_cont_p2+'.image', disk_mask=common_mask, noise_mask=noise_annulus) #MYLup_combined_contp2.image #Beam 0.072 arcsec x 0.057 arcsec (74.79 deg) #Flux inside disk mask: 78.11 mJy #Peak intensity of source: 3.35 mJy/beam #rms: 1.46e-02 mJy/beam #Peak SNR: 229.79 """ Third round of phase-only self-cal (all data) """ combined_p3 = prefix+'_combined.p3' os.system('rm -rf '+combined_p3) gaincal(vis=combined_cont_p2+'.ms', caltable=combined_p3, gaintype='T', combine='spw,scan', spw=combined_contspws, refant=combined_refant, calmode='p', solint='180s', minsnr=1.5, minblperant=4) if not skip_plots: """ Inspect gain tables """ plotcal(caltable=combined_p3, xaxis='time', yaxis='phase', subplot=441, iteration='antenna', timerange=LB1_obs0_timerange, plotrange=[0,0,-180,180]) plotcal(caltable=combined_p3, xaxis='time', yaxis='phase', subplot=441, iteration='antenna', timerange=LB2_obs1_timerange, plotrange=[0,0,-180,180]) """ Apply the solutions """ applycal(vis=combined_cont_p2+'.ms', spw=combined_contspws, spwmap=combined_spwmap, gaintable=[combined_p3], interp='linearPD', calwt=True, applymode='calonly') """ Split off a corrected MS """ combined_cont_p3 = prefix+'_combined_contp3' os.system('rm -rf %s*' % combined_cont_p3) split(vis=combined_cont_p2+'.ms', outputvis=combined_cont_p3+'.ms', datacolumn='corrected') """ Image the results; check the resulting map """ tclean_wrapper(vis=combined_cont_p3+'.ms', imagename=combined_cont_p3, mask=common_mask, scales=LB_scales, threshold='0.05mJy', uvtaper=['0.04arcsec'], savemodel='modelcolumn') estimate_SNR(combined_cont_p3+'.image', disk_mask=common_mask, noise_mask=noise_annulus) #MYLup_combined_contp3.image #Beam 0.072 arcsec x 0.057 arcsec (74.79 deg) #Flux inside disk mask: 78.09 mJy #Peak intensity of source: 3.42 mJy/beam #rms: 1.39e-02 mJy/beam #Peak SNR: 246.18 """ Fourth round of phase-only self-cal (all data) """ combined_p4 = prefix+'_combined.p4' os.system('rm -rf '+combined_p4) gaincal(vis=combined_cont_p3+'.ms', caltable=combined_p4, gaintype='T', combine='spw,scan', spw=combined_contspws, refant=combined_refant, calmode='p', solint='60s', minsnr=1.5, minblperant=4) if not skip_plots: """ Inspect gain tables """ plotcal(caltable=combined_p4, xaxis='time', yaxis='phase', subplot=441, iteration='antenna', timerange=LB1_obs0_timerange, plotrange=[0,0,-180,180]) plotcal(caltable=combined_p4, xaxis='time', yaxis='phase', subplot=441, iteration='antenna', timerange=LB2_obs1_timerange, plotrange=[0,0,-180,180]) """ Apply the solutions """ applycal(vis=combined_cont_p3+'.ms', spw=combined_contspws, spwmap=combined_spwmap, gaintable=[combined_p4], interp='linearPD', calwt=True, applymode='calonly') """ Split off a corrected MS """ combined_cont_p4 = prefix+'_combined_contp4' os.system('rm -rf %s*' % combined_cont_p4) split(vis=combined_cont_p3+'.ms', outputvis=combined_cont_p4+'.ms', datacolumn='corrected') """ Image the results; check the resulting map """ tclean_wrapper(vis=combined_cont_p4+'.ms', imagename=combined_cont_p4, mask=common_mask, scales=LB_scales, threshold='0.05mJy', uvtaper=['0.04arcsec'], savemodel='modelcolumn') estimate_SNR(combined_cont_p4+'.image', disk_mask=common_mask, noise_mask=noise_annulus) #MYLup_combined_contp4.image #Beam 0.072 arcsec x 0.057 arcsec (74.79 deg) #Flux inside disk mask: 78.05 mJy #Peak intensity of source: 3.54 mJy/beam #rms: 1.37e-02 mJy/beam #Peak SNR: 259.09 """ Amplitude self-cal (all data) """ combined_ap = prefix+'_combined.ap' os.system('rm -rf '+combined_ap) gaincal(vis=combined_cont_p4+'.ms', caltable=combined_ap, gaintype='T', combine='spw,scan', spw=combined_contspws, refant=combined_refant, calmode='ap', solint='900s', minsnr=3.0, minblperant=4, solnorm=False) if not skip_plots: """ Inspect gain tables """ plotcal(caltable=combined_ap, xaxis='time', yaxis='amp', subplot=441, iteration='antenna', timerange=LB1_obs0_timerange, plotrange=[0,0,0,2]) plotcal(caltable=combined_ap, xaxis='time', yaxis='amp', subplot=441, iteration='antenna', timerange=LB2_obs1_timerange, plotrange=[0,0,0,2]) """ Apply the solutions """ applycal(vis=combined_cont_p4+'.ms', spw=combined_contspws, spwmap=combined_spwmap, gaintable=[combined_ap], interp='linearPD', calwt=True, applymode='calonly') """ Split off a corrected MS """ combined_cont_ap = prefix+'_combined_contap' os.system('rm -rf %s*' % combined_cont_ap) split(vis=combined_cont_p4+'.ms', outputvis=combined_cont_ap+'.ms', datacolumn='corrected') """ Image the results; check the resulting map """ tclean_wrapper(vis=combined_cont_ap+'.ms', imagename=combined_cont_ap, mask=common_mask, scales=LB_scales, threshold='0.05mJy', uvtaper=['0.04arcsec'], savemodel='modelcolumn') estimate_SNR(combined_cont_ap+'.image', disk_mask=common_mask, noise_mask=noise_annulus) #MYLup_combined_contap.image #Beam 0.071 arcsec x 0.057 arcsec (74.85 deg) #Flux inside disk mask: 78.83 mJy #Peak intensity of source: 3.37 mJy/beam #rms: 1.30e-02 mJy/beam #Peak SNR: 258.93 """ Final outputs """ """ Save the final MS """ os.system('cp -r '+combined_cont_ap+'.ms '+prefix+'_continuum.ms') os.system('tar cvzf '+prefix+'_continuum.ms.tgz '+prefix+'_continuum.ms') """ Make a fiducial continuum image (based on experimentation) """ scales = [0, 5, 30, 75] tclean_wrapper(vis=combined_cont_ap+'.ms', imagename=prefix+'_continuum', mask=common_mask, scales=scales, threshold='0.05mJy', robust=0., uvtaper=['0.039arcsec','0.015arcsec', '162.7deg']) exportfits(prefix+'_continuum.image', prefix+'_continuum.fits')