bpVals
bpVals — String of white space- or comma-separated values of breakpoints
Content model
bpVals : 
     (#PCDATA)Description
      bpVals is a set of breakpoints (i.e., a set of independent
      variable values associated with one dimension of a gridded table
      of data). An example would be the Mach or angle-of-attack values
      that define the coordinates of each data point in a
      2D coefficient value table.