Grouping by container

If your data exists in HDS container files so that one container file contains all the images from a single exposure, then adding Set headers is easier. By running MAKESET with MODE=CONTAINER, it will assume that each HDS container file corresponds to a single Set. In this case you can just type something like

% makeset in='obs*' mode=container accept

and the correct headers will be added.

Note that if your data initially exists in the form of one Multi-Extension FITS file (MEF) per observation you can convert these quite easily to HDS container files using the FITS2NDF command with CONTAINER=TRUE. So supposing you have three exposures, each stored in a 2-HDU MEF, you can do:

% convert

   CONVERT commands are now available -- (Version 1.3-5 2001 January)

   Defaults for automatic NDF conversion are set.

   Type conhelp for help on CONVERT commands.
   Type "showme sun55" to browse the hypertext documentation.

% fits2ndf 'obs*.fits' 'conv-*' container=true
3 files selected.

% makeset 'conv-obs*' mode=container accept

    MAKESET
    =======
  6 input NDFs accessed using parameter IN

 Set name  Set index   NDF name
 --------  ---------   --------

 conv-obs1:
               1       conv-obs1.HDU_1
               2       conv-obs1.HDU_2

 conv-obs2:
               1       conv-obs2.HDU_1
               2       conv-obs2.HDU_2

 conv-obs3:
               1       conv-obs3.HDU_1
               2       conv-obs3.HDU_2

For subsequent work you need only supply the names of the container files (conv-obs*) and the CCDPACK commands will look inside and find the data frames with their associated Set header information. See SUN/55 for a full description of the CONVERT facility.