Define symbol characteristics. The INTERPOL= option specifies a cubic regression analysis with confidence limits for mean predicted values. The VALUE=and CV= options specify a plot symbol and color. The CI=, CO=, and WIDTH= options specify colors and a thickness for the interpolation and confidence-limits lines.

symbol1 interpol=rcclm95
       value=circle
       cv=darkred
       ci=black
       co=blue
       width=2;