N_bytes()

       To return the total number of bytes in data element

       result = N_bytes(a)

       a - any idl data element, scalar or array

       total number of bytes in a is returned as the function value
       (longword scalar)

       (1) Not valid for object or pointer data types
       (2) For a string array, the number of bytes is computed after conversion
           with the BYTE() function, i.e. each element has the same length,
           equal to the maximum individual string length.

       Version 1  By D. Lindler  Oct. 1986
       Include new IDL data types    W. Landsman          June 2001

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