Nodata Keyword
Used With Routines:  AXIS, BAR3D,  CONTOUR,  CONTOURFS,  CONTOUR2,  OPLOT,  PLOTSHADE_SURFSHADE_SURF_IRR,  SURFACE
Corresponding System Variable: None.
If this keyword is set, only the axes, titles, and annotation are drawn. No data points are plotted.
Example
To draw an empty set of axes between some given values:
PLOT, [0, 10], [0, 20], /Nodata