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IND=<variable>,<lower_limit>,<upper_limit> 
                 optional      optional
                 default=1     default=lower limit

is a specification which limits the observations in connection with
various statistical operations. Only observations where
   lower limit <= value of variable <= upper limit
will be processed.
As <variable> also ORDER, i.e. the index of observation is permitted.
Example: IND=Weight,50,55

For numerical missing values conditions like IND=<variable>,MISSING and
IND=<variable>,!MISSING (not missing) are available.
These extensions will be gradually introduced in versions 1.32+ .

  S = More information on selection of observations