Selection of the Cartesian linear transformation with regular floating point coordinates
will result in a simple linear scaling of the input coordinates. The projection
is defined by stating

scale in inches/unit (**-Jx**) or axis length in inches (**-JX**)

If the *y*-scale or *y*-axis length is different from that of
the *x*-axis (which is most often the case), separate the two
scales (or lengths) by a slash, e.g., **-Jx**0.1i/0.5i or **-JX**8i/5i.
Thus, our data sets will plot as shown in Figure 5.1.

The complete commands given to produce this plot were

psxy -R0/100/0/10 -JX3i/1.5i -Ba20f10g10/a2f1g2WSne -W1p,- -P -K sqrt.d > GMT_linear.ps psxy -R -JX -St0.075i -Glightgray -W -O sqrt.d10 >> GMT_linear.ps

Normally, the user's