The default plotting unit (minimum step) is 0.1 mm in Survo PostScript plotting. On high resolution printers (600 dpi or more) this is not accurate enough especially in curve plotting when best possible quality is demanded. Therefore the plotting unit can be altered by a specification PS_UNIT=<step> where PS_UNIT=0.1 is the default setting. For high quality curve plotting PS_UNIT=0.01 is recommended. Too accurate units should be avoided since the largest permitted size is SIZE=32767,32767 i.e. about 32.7 cm x 32.7 cm for PS_UNIT=0.01 . The following example (next page) illustrates the difference. PLOT X(T)=R*COS(T),Y(T)=R*SIN(T) R=10 XDIV=0,1,0 YDIV=0,1,0 HEADER= FRAME=0 T=0,2*pi,pi/120 pi=3.14159 DEVICE=PS,K1.PS SIZE=1500,1500 PLOTTING WITH DEFAULT RESOLUTION LINETYPE=[BLACK][line_width(0.48)] ................................................................................ PLOT X(T)=R*COS(T),Y(T)=R*SIN(T) R=10 XDIV=0,1,0 YDIV=0,1,0 HEADER= FRAME=0 T=0,2*pi,pi/120 pi=3.14159 DEVICE=PS,K2.PS SIZE=15000,15000 PS_UNIT=0.01 PLOTTING IN 0.01 mm RESOLUTION LINETYPE=[RED][line_width(0.48)] ................................................................................ PRINT CUR+1,END TO K.PS / Red curve is smoother than the black one. [scaling(35,35)][home(-550,-3000)] picture K1.PS picture K2.PS P = More information on PostScript printing

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