GPCLOSE closes the current graphics output file.
INPUT PARAMETERS
None
PROGRAM DESCRIPTION
This program closes the graphics output file, if the current
device produces an intermediate plot file. The plot file
commands may be sent to the device using GPOUT. It is not
necessary to call GPCLOSE before calling GPOUT.
ERROR MESSAGES
[GPCLOSE -1] Fatal error initializing TAE.
[GPCLOSE -3] Fatal error initializing GEMPLT.