!!!Missing exposures and bright exposures - example

The study PRY_footpoints_HI2 is an interesting test case as it has a large number of wavelength windows (23) and the windows vary significantly in size.

There are 6 problem exposures: numbers 26, 57, 58, 59, 61 and 88.

Extracting the exposure times using the getexp() method yields zero exposure times for exposures 57, 58, 59 and 88, but not 26 and 61.

The table below goes through wavelength window and indicates the problems for the 6 exposures.


|| Window || Detector || Size || 26 || 57 || 58 || 59 || 61 || 88
| Fe XI 182.20    | SW | 32 | OK | Dark | Dark | Dark | OK | Dark
| Fe X 184.60     | SW | 80 | OK | Dark | Dark | Dark | OK | Dark
| Fe XII 186.75   | SW | 40 | OK | Dark | Dark | Dark | OK | Dark
| Fe XI 188.40    | SW | 64 | OK | Dark | Dark | Dark | OK | Dark
| Ca XVII 192.82  | SW | 40 | OK | Dark | Dark | Dark | OK | Dark
| Fe XII 195.48   | SW | 96 | OK | Dark | Dark | Dark | OK | Dark
| Fe IX 197.86    | SW | 24 | OK | Dark | Dark | Dark | OK | Dark
| S VIII 198.57   | SW | 24 | OK | Dark | Dark | Dark | OK | Dark
| Fe XIII 202.04  | SW | 32 | OK | Dark | Dark | Dark | OK | Dark
| Fe XIII 203.83  | SW | 32 | OK | Dark | Dark | Dark | OK | Dark
| O V 248.95      | LW | 64 | Bright (W) | Dark | Dark | Dark | Bright (W) | Dark
| Al VIII 250.50  | LW | 48 | Dark | Dark | Dark | Dark | Dark | Dark
| Fe VIII 253.98  | LW | 40 | Dark | Dark | Dark | Dark | Dark | Dark 
| He II 257.30    | LW | 128| Dark | Dark | Dark | Dark | Dark | Dark 
| Fe XVI 262.98   | LW | 24 | Dark | Dark | Dark | Dark | Dark | Dark 
| S X 264.50      | LW | 40 | Dark | Dark | Dark | Dark | Dark | Dark 
| Mg VI 268.99    | LW | 24 | Dark | Dark | Dark | Dark | Dark | Dark 
| Fe XIV 274.20   | LW | 32 | Dark | Dark | Dark | Dark | Dark | Dark 
| Mg V 276.31     | LW | 120| Dark | Dark | Dark | Dark | Dark | Dark 
| Mg VII 278.39   | LW | 32 | Dark | Dark | Dark | Dark | Dark | Dark
| O IV 279.80     | LW | 32 | Bright (W) | Bright (W) | Dark | Dark | Bright (W) | Bright (W)
| Mg VII 280.75   | LW | 32 | OK | Bright | Dark | Dark | OK | Bright
| Fe XV 284.16    | LW | 24 | OK | Bright | Dark | Dark | OK | Bright

The descriptors for the pixels are:

OK - normal exposure\\
Dark - no signal at all in exposure \\
Bright - exposure is normal but intensities are anomalously bright at every pixel\\
Bright (W) - exposure is anomalously bright but spectrum is weird\\

The anomalously bright exposures 57 and 88 for the Mg VII 280.75 and Fe XV 284.16 windows are probably due to the fact that exposure times of 0 have been assigned to these exposures. When the intensity is computed, a division by the exposure time is performed. It seems likely that an arbitrarily small exposure time has been used giving a much higher intensity value than normal.