Parameters

 Keyword  Posn  Type       Description
 -------  ----  ----       -----------
 INP       1    CHARACTER  Input datafile name
 OUT       2    CHARACTER  Output datafile name
   -> GLOBAL.BINDS (the current binned dataset)
 APP_DIM   3    INTEGER    Dimension over which the spline should
                           be fitted.
 LOWER     4    REAL       The lower edge of the range for a
                           parameter.
 UPPER     5    REAL       The upper edge of the range for a
                           parameter.
 KWIDTH    6    INTEGER    Number of data bins between knots in
                           the spline.