GROUPING = 1

LSC_X = UCLX = upper control limit for X Chart = X_m + A₂ * R
LIC_X = LCLX = lower control limit for X Chart = X_m - A₂ * R where X_m = X

LSC_R = upper control limit for R Chart = D₄ * R LIC_R = lower control limit for R Chart = D₃ * R