*SPECTRA

spectrum-name 〚 [index-range] 〛 number-of-channels 〚type〛〚 DISC 〛

where index-range is expressed as
lower-limit: upper-limit
and lower-limit and upper-limit are optional integer values which allow more than one spectrum to be declared by a single statement.
See Indexed Spectrum Updates section for an example application.

and number-of-channels is one of:

`integer`	1D spectrum
`integer`* `integer`	Rectangular 2D spectrum
2D	Square 2D spectrum
`integer`* `integer`* `integer`	Cuboid
3D	Symmetrised 1/6 cube

and type (optional) is:

8	Signed byte precision, 8-bits per channel
16	Signed single precision, 16-bits per channel
32	Signed double precision, 32-bits per channel

The optional keyword DISC makes the spectrum disc-based during sorting.

If type is omitted then the default of 32 is assumed for 1D, 16 for 2D and 3D.

By default, spectra are sorted into shared memory. It is the user's responsibility to ensure that there is sufficient memory available. Any combination of memory and disc-based spectra may be specified but as the sort package is essentially memory-based and is not fully optimised for disc-based sorting, the use of disc-updated spectra will degrade the performance.

For the maximum number of spectra allowed, see Appendix A.

Example

Some typical spectrum declarations might be:

*SPECTRA
TIME 1024                   // 1D 16-bit, 1024 channels
GEL1 4096 32                // 1D 32-bit, 4096 channels
GEL3 4096*1024              // 2D 16-bit, 4096 by 1024 channels
GEL4 1024 2D                // 2D 16-bit, 1024 channels square
GSPEC 1024*1024*8           // 3D 16-bit, 1024 by 1024 by 8 channels
SM[4:10] 4000               // 7 1D 16-bit spectra, 4000 channels each
CUBE[1:5] 16 3D 8           // 5 3D 8-bit 16 channel cubes


Data arrays		*AUTOGAIN