Sets the color for cmap1 (see the section called “Color Map1”).  
- 
	  col1(PLFLT
- 
	    This value must be in the range (0.0-1.0) and is mapped to
	    color using the continuous cmap1 palette which by default
	    ranges from blue to the background color to red.  The cmap1
	    palette can also be straightforwardly changed by the user with
	    - plscmap1or- plscmap1l.
 
      Redacted form: plcol1(col1)
    
      This function is used in examples 12 and 21.