Example

  ICL> ast2qdp time_series_a time.qdp
  % cat time.qdp
  READ SERR 2
  LABEL X "MJD"
  LABEL Y "Intensity (count/s)"
  45001.2  2.34 0.04
  45002.1  1.22 0.07
  45003.0  0.05 0.12
  45003.9  1.45 0.11
  45004.8  1.37 0.04
  ...