37.5 Calibration Quality Files

The initial error in the data is assumed to be Poisson-limited. The error is propagated mathematically through the calibration process. The propagated statistical error file (.c2h) contains a measure of the statistical errors of the original data values; this file is calibrated in lock-step with the science data files.

The flux data quality file (.cqh) flags bad pixel values in the calibrated flux and propagated statistical error files.

Special diodes data quality files (.c4h) flags bad pixel values in the calibrated special diodes file (.c3h). Good pixel values are identified by a zero value.

Calibrated Data Quality Flags

Flag Value	Description
Category 1: Data not useful -data values set to zero
800	Data filled
400	Dead or disabled channel
300	Severe saturation (uncertainty >50%)
Category 2: Data uncertain-uncertainty not indicated in error computation
190	Large saturation correction (uncertainty > 20%)
180	Photocathode blemish (deep)
150	Photocathode blemish (medium)
140	Photocathode blemish (small)
130	Moderate saturation correction (uncertainty >5%)
100	Reed-Solomon decoding error
Category 3: Data uncertain-uncertainty indicated in propagated error file
30	Dead diode contributed to comb-added data point