Halpha.save
  line   Atlas profile of the H alpha line

DOT_data.save
  ca1    Ca II H image, observing time 10:58:46
  gb1    G-band image, observing time 10:58:46
  gb2    G-band image, observing time 10:59.21
  ham350 H alpha -350mA image
  hap350 H alpha +350mA image
Pixel size is 0.071"/pixel.

DOT_raw.save
  raw    G-band raw image
  dark   darkfield
  flat   flatfield

TRACE_1d.save
  d16    1600A time sequence
  d17    1700A time sequence
Cadence is 13s, time delay from 1700 to 1600 is 5.5739926s.

TRACE_3d.save
  d16    1600A time sequence
Pixel size is 0.5"/pixel, cadence is 39s.
