fcollen -- Modify the vector length of a column in a binary table extension of a fits file.
fcollen fitsfile[ext] colname collen
This task changes the vector length of a column in a binary table extension to the length specified by the user. The data type of the column is not changed. This program can not be applied to other types of extension (ASCII table or image).
Change the vector length of column "data" of the extension "event" of the fits file "myfile.fits" to 20.
fcollen myfile.fits[event] data 20