Use the HELP,/STRUCTURE command to determine the type, structure, and tag name of each field in a structure. In the example above, a structure was stored into variable A. The statement,

HELP, /STRUCTURE, A

prints the following information:

** Structure STAR, 4 tags, length=40:

NAME            STRING    'SIRIUS'

RA              FLOAT           30.0000

DEC             FLOAT           40.0000

INTEN           INT       Array(12)

Using HELP with anonymous structures prints the structure’s name as a unique number enclosed in angle brackets. Calling HELP with the STRUCTURE keyword and no parameters prints a list of all defined, named structure types and their tag names.