PGPLOT Device Tasks

There are a number of tasks that display on a PGPLOT device. These devices include, of course, postscript disk files that you can spool to a laser printer (see Chapter 3 for details of how to use PGPLOT). For image display, there is a suite of tasks called cginit, cgdisp, cgcurs, cgslice, and cgspec. We will discuss the first four in this chapter, and cgspec in Chapter 19.

The `CG' tasks attempt to label the plots in the correct non-linear axes. Provided the field is not too large, the labelling is good (use options=grid to see the non-linearities more clearly). However for for very large fields or where the non-linearity is particularly severe (e.g. south celestial pole), the `CG' tasks will fail to label adequately.