15.46  MERGE 

MERGE [ALL]
     [SETS=[FROM] n1 [TO] [n2]]
     [SELECT="name"]
     [NAMe="name"]
     [POINTS=[FROM] n1 [TO] [n2]]
     [APPEND[=ON|OFF]] [NAME="name"] [LOG[=ON|OFF]]
     [LIMITED [VLOG[=ON|OFF]] [[FROM]|TO [[X=]nx,[[Y=]ny[,[Z=]nz]]]
          [CURSOR] ]

Merges the specified data points into a single data set.
     1.  ALL merges all data
     2.  APPEND  creates  a  new  data set and copies all of the specified
         sets into it.  If not specified then the specified range of  data
         sets is deleted.
     3.  LIMITED  allows you to specify which points to retain, all others
         are deleted or omitted in the case of APPEND.
     4.  LOG shows which sets are merged.
     5.  NAME specifies the name of the new data set.
     6.  POINTS selects the data points by number
     7.  SETS selects the range of data sets to merge.
     8.  SELECT selects the data sets by name
You must specify either SETS, POINTS, LIMITED, or ALL If the range of data
sets contains a mesh data set and APPEND is not specified,  the  data  can
not be merged.

After  merging several data sets you may need to SORT the data if you wish
to HISTOGRAM, JOIN, or BARCHART it.