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66 CHAPTER 8. SURFACE AND CONTOUR PLOTS2begin surfacesize 5 5data "surf1.z"zaxis min -1rotate 85 85 0view 0 5 0.7end surfaceView point10-12 3 4 51 2 3 4top [off] [lstyle n ] [color c ]Sets the features of the top of the surface. By default the top is on.(see also UNDERNEATH, XLINES, YLINES)underneath [off] [lstyle n ] [color c ]Sets the features of the under side of the surface. By default the underneath is off.(see also TOP, XLINES, YLINES)back [zstep v ] [ystep v ] [lstyle l ] [color c ] [nohidden]Draws a grid on the back face of the cube.By default hidden lines are removed but NOHIDDEN will stop this from happenning.base [xstep v ] [ystep v ] [lstyle l ] [color c ] [nohidden]Draws a grid on the base of the cube.By default hidden lines are removed but NOHIDDEN will stop this from happenning.right [zstep v ] [xstep v ] [lstyle l ] [color c ] [nohidden]Draws a grid on the right face of the cube.By default hidden lines are removed but NOHIDDEN will stop this from happenning.skirt onDraws a skirt from the edge of the surface to ZMIN.begin surfacesize 5 5data "surf1.z"zaxis min -1 max 3xtitle "X-axis"ytitle "Y-axis"ztitle "Z-axis"points "surf3.dat"riselines lstyle 2marker fcircleskirt onrotate 60 35 0view 2.5 3 0.6end surfacepoints myfile.datReads in a data file which must have 3 columns (x,y,z)0-0.5-1This is then used for plotting markers and rise and drop lines.Z-axis32.521.510.51 2 3 4 5X-axis1 2 3 Y-axis4marker circle [hei v ] [color c ]Draws markers at the co-ordinates read from the POINTS file.droplines [color c ] [lstylen ]Draws lines from the co-ordinates read from the POINTS file down to zmin.riselines [color c ] [lstyle n ]Draws lines from the co-ordinates read from the POINTS file up to zmax.