GROUPING = 1

LSCXLSCX = UCLX = upper control limit for X Chart = Xm + A2 * R
LICXLICX = LCLX = lower control limit for X Chart = Xm - A2 * R where Xm = X

LSCXLSCX = UCLX = upper control limit for X Chart = Xm + A2 * R
LICXLICX = LCLX = lower control limit for X Chart = Xm - A2 * R where Xm = X