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If you want to access your image data via mapping use STFMAP
(SCFMAP). This routine `maps' an existing Bulk Data Frame
(or parts of it) into virtual memory for reading and/or writing.
The technique used to map data returns a pointer which is definitely
not very FORTRAN like. Look at the examples in Appendix
to see how this problem is solved for FORTRAN programs
(for C there is no problem anyway).
If the file has been opened using a different data format than the original
format, data are converted automatically.