pro GrabBegEnd,DumpData,DumpMissVal,XYear0,XYear1

DimDumpData=size(DumpData) & DumpYearN=DimDumpData(2)

XYear0=-1 & XDumpYear=-1
while (XYear0 LT 0 AND XDumpYear NE DumpYearN) do begin
  XDumpYear = XDumpYear + 1
  for XMonth = 0, 11 do begin
    if (DumpData(XMonth,XDumpYear) NE DumpMissVal) then XYear0 = XDumpYear
  endfor
endwhile
      
XYear1=-1 & XDumpYear=DumpYearN
while (XYear1 LT 0 AND XDumpYear NE -1) do begin
  XDumpYear = XDumpYear - 1
  for XMonth = 0, 11 do begin
    if (DumpData(XMonth,XDumpYear) NE DumpMissVal) then XYear1 = XDumpYear
  endfor
endwhile

end