*** Re-reducing our M82 observations ***

*** Some ideas and initial information ***

*** prepared by Giles, July 2010 ***


RUNS: Feb-2007, early-April-2007, late-April-2007

WAVELENGTH: 350 for all three

GOALS: see whether we can improve on Lero's analysis by 

   - including more files, even when galaxy is "lost in the 
      bad pixels" (interpolate the FAZO and FZAO; see below)

   - inspecting the individual sharpinteg Q U outputs: discard 
     files as necessary, develop "custom RGM files" if warranted

   - seeing whether the following improve the corrected errors:

       - using the "-m" flag
  
       - loosening the chopper tolerance 
  
RGM: posted on run-by-run section
     note: see note posted by Giles on Feb 2007 run-by-run section
     note: for the late-April run, two RGMs are posted.  use the 
           350 micron RGM, of course

"hwp" FLAG: listed as 90,90,88 on the run-by-run section and table of
     v-nulls.  use 90, since there is some ambiguity noted for the
     late-April run

I.P.: use the standard i.p. that we use for all 350 micron observations 
      made since summer 2008 (see John's July 2007 posting on analysis logbook)

POINTING: contact Lero for FAZO, FZAO on selected files.  Interpolate for
          others, when possible.

SMOOTHED TAU:  

   - Below I have copied a series of e-mails from John that tell how to 
     calculate the smoothed tau for one's data files, starting from posted 
     polynomial fits.  Of course one can also develop one's own procedure 
     for doing this.

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You can find an example script for generating the smoothed tau from the SHARC tau fits 
(different from what Darren does) at sharp@zamin:Runs/2008may/process/dr21/dotau.

You will have to edit the script for the file numbers of interest, and may also need to 
download the latest update of tau225_all.fit 
(http://www.submm.caltech.edu/~sharc/analysis/taufit/225Ghz/tau225_all.fit).

-John
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Plots of smooth tau fits are available at http://www.submm.caltech.edu/~sharc/

From this at least you can get an idea of how much to believe the header tau values.

I have scripts lying around on zamin for extracting numbers from these fits.  Anybody 
who can make a dointeg file will be able to make their own custom tau scripts as a 
function of object.

-John
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One such script on sharp@zamin is ~/Runs/2009mar/process/cb68/dotau.

I usually copy the file list in this script from the "dointeg" script, making sure I match 
it exactly (perhaps minus known bad files).  That way it is easy to cut and paste the data 
output to the file "tau.out" into the sharp_combine input file so that the output tau225 
values is matched to the correct file on the correct row.

-John 
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