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##

LIMITS

[GREG1\]LIMITS [X1 X2 Y1 Y2 [Unit]] [/XLOG] [/YLOG] [/RGDATA]
[/BLANKING Bval Eval] [/REVERSE [X] [Y]] [/VARIABLES Array_X Array_Y]
[/MARGIN [...]]
Sets the coordinates of the plot region. The limits are the user coordi-
nates of the BOX corners, and in conjunction with the BOX_LOCATION,
specifies the conversion formula between USER and PLOT coordinates.
The limits can be computed from different data:
- if LIMITS has no arguments, it will compute automatic limits using
data from the most recent COLUMN X and Y, if any,
- if the option /RGDATA is present, the current Regular Grid map is
used, if any,
- if the option /VARIABLES Array_X Array_Y is present, the named SIC
variables are used.
Options /RGDATA and /VARIABLES are exclusive.
Some special characters are allowed instead of numerical values for the
limits :
* Compute automatic limit for this argument
< Compute automatic limit for this argument, and take
the minimum of this value and the precedent limit.
> Same as above, but take the maximum.
= Keep the precedent value for this limit.
An additional argument can be used when a projection and a system are
defined. It may take values
- RADIAN : The values are assumed to be normal projected coordinates
from the projection center.
- SECOND, MINUTE or DEGREE : The values are converted from the speci-
fied angular unit to radians. They still represent offsets from the
projection center.
- ABSOLUTE : The values are assumed to be absolute coordinates on the
sphere. APPROXIMATE corresponding projected coordinates are computed
from these values (the projected coordinates are necessarily approx-
imate since in general e.g. the upper left and lower left corner of
the box correspond to different absolute Right ascension for Equato-
rial system).
The default value is the current angle unit as defined by SET ANGLE.

**Subsections**

Gildas manager
2020-07-04