NAME

       funmerge - merge one or more Funtools table files

SYNOPSIS

       funmerge  [-w⎪-x] -f [colname] <iname1> <iname2>  ... <oname>

OPTIONS

         -f    # output a column specifying file from which this event came
         -w    # adjust position values using WCS info
         -x    # adjust position values using WCS info and save old values

DESCRIPTION

       funmerge merges FITS data from one or more FITS Binary Table files or raw event files.

       The  first  argument to the program specifies the first input FITS table or raw event file. If "stdin" is
       specified, data are read from the  standard  input.   Use  Funtools  Bracket  Notation  to  specify  FITS
       extensions  and  row  filters.   Subsequent arguments specify additional event files and tables to merge.
       (NB: Stdin cannot not be used for any of these additional input file arguments.)  The  last  argument  is
       the output FITS file. The columns in each input table must be identical.

       If  an input file begins with the '@' character, it is processed as an include file, i.e., as a text file
       containing event file names (as well as blank lines and/or comment lines starting with the '#' sign).  If
       standard input is specified as an include file ('@stdin'), then file names are  read  from  the  standard
       input until EOF (^D).  Event files and include files can be mixed on a command line.

       Rows  from  each  table  are  written  sequentially  to  the  output file.  If the switch -f [colname] is
       specified on the command line, an additional column is added to each row containing  the  number  of  the
       file  from  which  that row was taken (starting from one). In this case, the corresponding file names are
       stored in the header parameters having the prefix FUNFIL, i.e., FUNFIL01, FUNFIL02, etc.

       Using the -w switch (or -x switch as described below), funmerge  also  can  adjust  the  position  column
       values  using  the WCS information in each file. (By position columns, we mean the columns that the table
       is binned on, i.e., those columns defined by the bincols= switch, or (X,Y) by default.)  To  perform  WCS
       alignment,  the  WCS  of  the  first file is taken as the base WCS.  Each position in subsequent files is
       adjusted by first converting it to the  sky  coordinate  in  its  own  WCS  coordinate  system,  then  by
       converting  this sky position to the sky position of the base WCS, and finally converting back to a pixel
       position in the base system. Note that in order  to  perform  WCS  alignment,  the  appropriate  WCS  and
       TLMIN/TLMAX keywords must already exist in each FITS file.

       When  performing  WCS  alignment,  you can save the original positions in the output file by using the -x
       (for "xtra") switch instead of the -w switch (i.e., using this switch also  implies  using  -w)  The  old
       positions  are  saved  in columns having the same name as the original positional columns, with the added
       prefix "OLD_".

       Examples:

       Merge two tables, and preserve the originating file number for each  row  in  the  column  called  "FILE"
       (along with the corresponding file name in the header):

         [sh] funmerge -f "FILE" test.ev test2.ev merge.ev

       Merge two tables with WCS alignment, saving the old position values in 2 additional columns:

         [sh] funmerge -x test.ev test2.ev merge.ev

       This program only works on raw event files and binary tables. We have not yet implemented image and array
       merging.

SEE ALSO

       See funtools(7) for a list of Funtools help pages

version 1.4.5                                    April 14, 2011                                      funmerge(1)