USING DAOPHOT AT ESO:
 
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.) Bug fix, 15.7.1988, in FOTOMETRY.  Concerns determination of mean
   sky background.  See F. Murtagh for details received from P. Stetson.

  
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0) CHANGES - OCTOBER 1987:  Columns labelled X and Y are used in MIDAS
   tables (instead of X_AXIS and Y_AXIS as heretofore).  Be careful with
   table names when converting between DAOPHOT tables and MIDAS ones, -
   the latter have augmented names which could become too long for some MIDAS
   commands!

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1) To convert MIDAS tables to .COO files, and .COO/.PK/.NST/.ALS files to
   MIDAS tables, use the commands MIDDAO/TAB and DAOMID/TAB.  One parameter
   is needed in each case, - the input table name.

   MIDDAO takes xxx.TBL, looks for columns labelled X and Y
   (as produced, e.g., by cursor input), and creates the file xxx.COO (with
   two columns).
   
   DAOMID takes xxx.COO, xxx.PK, xxx.NST, or xxx.ALS and produces xxxCOO.TBL, 
   xxxPK.TBL, xxxNST.TBL, or xxxALS.TBL respectively.

   Next, some more details of these commands ...

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2) DAOPHOT uses pixel coordinates, and INVENTORY and MIDAS use world 
   coordinates. Hence, in converting to MIDAS, the user can give image
   "start" and "stepsize" values to accomplish this transformation.
   Similarly, the reverse transformation can be carried out, when 
   creating a .COO file from a .TBL one. 

   The user gives start and stepsize values by writing them into a
   keyword called TRANSF, before calling DAOMID/TAB or MIDDAO/TAB.
   Unless altered by the user, the keyword values will not normally
   change in a session.  Example: start values of 3.0 and 4.0 in X
   and Y, and stepsizes of 1.0 in both:

   WRITE/KEY TRANSF/R/1/4 3.0,4.0,1.0,1.0

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3) Further points to bear in mind in relation to repeated conversions
   of tables between DAOPHOT and MIDAS formats:
   
   DAOMID will convert QQ.COO into QQCOO.TBL.
   MIDDAO will convert QQCOO.TBL into QQCOO.COO.

   Warning: MIDAS limits the table name to 8 characters.
   Warning: If the input table does not exist (e.g. you have misspelled
            the name), the error message may not be very explicit.


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4) A template Photmetric table for DAOPHOT that can be modified and
   stored in your own disk is found in,
  
            DAO:PHOTO.TAB

   (Note that the directory where this, and most of the DAOPHOT source code,
   is to be found, is defined for convenience by the logical name, DAO.)

  
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5) Corrections to ESO DAOPHOT manual: on p. 45, VA (not VP) is variable
   PSF option identifier; location of DAOPHOT-related files (sources,
   etc.) have changed with the new MIDAS directory structure (June 1987).

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6) For further information see M. Auriere or J. Melnick or M. Pierre
   or S. Ortolani or F. Murtagh or R. Warmels or P. Stetson (in D.A.O.)
   ... AFTER YOU HAVE READ THE DAOPHOT USER'S MANUAL.  Have fun!