15.66  SMOOTH 

SMOOTH [{X|Y|Z|RADIUS|THETA|PHI}] [LEVEL=n]
     [APPEND[=ON|OFF]] [NAME="name"]
     [CHECK[=ON|OFF]]
     [ERROR[=ON|OFF]]
     [FLAT[=ON|OFF]] [AVERAGE[=ON|OFF]]
     [SETS=[FROM] n1 [TO] [n2]]
     [SELECT="name"]
     [POINTS|COLUMNS=[FROM] n1 [TO] [n2]]
     [LINES|ROWS=[FROM] n1 [TO] [n2]]
     [LIMITED [VLOG[=ON|OFF]] [[FROM]|TO [[X=]nx,[[Y=]ny[,[Z=]nz]]]
          [RECURSOR] [CURSOR] ]
     [LOG[=ON|OFF]] [MONITOR[=ON|OFF]]

Replace  the X,Y, or Z values by new values that give a smooth curve.  The
data is assumed to be a histogram of equally spaced  bins.   An  alternate
way  of  smoothing  data  is  by  convolution.   See COMMAND CONVOLUTE.  A
convolution may be used to both smooth and "sharpen" the data.