Title: ALMA observations of polarization from dust scattering in 
       the IM Lup protoplanetary disk 
Authors: Hull C.L.H., Yang H., Li Z.-Y., Kataoka A., Stephens I.W., Andrews S., 
         Bai X., Cleeves L.I., Hughes A.M., Looney L., P'erez L.M., Wilner D. 
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Description of contents: 

  Variables:

  Pc = polarized intensity (debiased)
  sigma_pol = the rms noise in the Stokes Q and U maps


  Files:
  
  FITS: IMLup_cont_image_I.pbcor.fits
                -Cleaned map of total intensity (Stokes I) dust emission
  
  FITS: IMLup_cont_image_Q.pbcor.fits
                -Cleaned map of Stokes Q dust emission
        
  FITS: IMLup_cont_image_U.pbcor.fits
                -Cleaned map of Stokes U dust emission
  
  FITS: IMLup_cont_image.pa.fits
		-Map of the position angle of the true dust polarization 
         	(not the magnetic field)
                -Results are masked where Pc < 3*sigma_pol

  FITS: IMLup_cont_image.pa_rms.fits
		-Map of the rms uncertainty in the position angle of the true dust polarization 
         	(not the magnetic field)
                -Results are masked where Pc < 3*sigma_pol

  FITS: IMLup_cont_image.pol.fits
                -Map of total debiased polarized dust emission
                -Results are masked where Pc < 3*sigma_pol

  FITS: IMLup_cont_image.pfrac.fits
                -Map of the polarization fraction of the dust emission
                -Results are masked where Pc < 3*sigma_pol

  FITS: IMLup_cont_image.pfrac_rms.fits
                -Map of the rms uncertainty in the polarization fraction of the dust emission
                -Results are masked where Pc < 3*sigma_pol


System requirements: A FITS reader is required to read the FITS files; 
  no other special programs are required.  
  
Additional comments: Note that the raw ALMA data are not included here, but 
  will available in from the ALMA archive once the proprietary period has 
  ended.  Reduced/calibrated data are also available from the lead author 
  (C. Hull).  All raw data are in CASA format, and thus require an 
  installation of CASA.
  
  The URL of the ALMA data archive is:
  https://almascience.nrao.edu/alma-data/archive
  
  To access the data used to produce the ALMA image in Figure 1, one must 
  query the project code 2016.1.00712.S.

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