UT    Exp   Time  flavor     comment       (S/N)^2 totals
========================================== b1   r1   b2   r2

  ----- sequence 10642, plate -9999 -------
 22:58 10642 0.0    bias        {{}}
  23:01 10643 0.0    bias        {{}}
   ----- sequence 10644, plate 625 -------
 00:42 10644 0.0    bias        {{}}
  ----- sequence 10645, plate -9999 -------
 00:53 10645 0.0    bias        {{}}
 ----- sequence 10646, plate 625 -------
 02:26 10646 0.0    bias        {{}}
 02:50 10647 10.0   flat        pre-flat
 02:52 10648 2.0    arc         pre-arc
 03:11 10649 900.0  target      science