Add reference lines and specify colors. VREF= draws reference lines on the vertical axis at three marks. LVREF= specifies the line style (dashed) for the lines; CVREF= specifies blue as the line color. CAXIS= colors the axis lines and all major and minor tick marks. CTEXT= specifies red for all plot text, including axis labels and major tick mark values. 
                    vref=1000 3000 5000
                    lvref=2
                    cvref=blue
                    caxis=blue
                    ctext=red;
run;
quit;