Keywords: class

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### GREG functionalities

CLASS is mainly used for interactive look at spectra, hence its default values are all oriented towards fast plotting on screen. These defaults can be changed by command `SET`. If the value of a parameter is not controlled by CLASS, the command will be passed on to GREG for processing.

The following GREG presentation parameters are useful:

- `SET BOX_LOCATION` It can be set `to LANDSCAPE, PORTRAIT, SQUARE` or 4 numbers indicating the position of the box in the plot page (in centimeters).
- `SET CHARACTER Size` Control the size of characters in centimeters.
- `SET FONT Quality` Select the character quality to be used, `SIMPLEX` or `DUPLEX`. The fonts are identical to the ones used by GREG , and the character handling is the same (in command `DRAW TEXT`).
- `SET PLOT_PAGE ...` Define the page size. Warning: You will get into trouble if you want to abreviate this command to `SET PLOT` as `SET PLOT` is a valid CLASS command used to indicate whether spectra are broken lines of histograms. A way out of this is to abbreviate the GREG command as `GSET PLOT`.
- `SET TICK Size` Define the tick size in centimeters.

Note that you do not need to open a plotting window to produce a hardcopy through the `HARDCOPY` command. It is only much more convenient, but the plot (e.g. sequence of commands) and the way it is displayed (e.g. PS format, bitmap on a computer screen) are two completely independent things.

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