. . Starting Step 4.8 - Mean control chart for cassette, . but use cassette-cassette variation . for control limits. . y1label mean of line width x1label cassette line solid all character x BLANK BLANK BLANK BLANK BLANK BLANK xlimits 0 30 xtic offset 1 2 device 1 off device 2 off mean plot width cassette device 1 on device 2 on let ytemp = yplot retain ytemp subset tagplot = 1 let a = standard deviation ytemp let target = mean width let usl = target + 3*a let lsl = target - 3*a mean control chart width cassette let a1 = maximum xplot subset tagplot = 2 let a1 = a1 + 4 let a2 = maximum yplot subset tagplot = 2 let a3 = maximum yplot subset tagplot = 3 let a4 = maximum yplot subset tagplot = 4 let a6 = maximum yplot subset tagplot = 6 let a7 = maximum yplot subset tagplot = 7 movedata a1 a2 text Target movedata a1 a3 text UCL movedata a1 a4 text LCL movedata a1 a6 text UCL:lot-to-lot movedata a1 a7 text LCL:lot-to-lot line solid all character blank all xlimits xtic offset . Finished Step 4.8: Page Back for Output