eimsimreduce (eimsim-2.4.2) [xmmsas_20211130_0941-20.0.0]

For each of the input source-list columns X and Y: a histogram of position against flux

These are not so much histograms as binned averages of various position-related quantities at a series of values of detected flux. This pair of histograms is written to tables X_VS_S and Y_VS_S in the output data set.

Log10 of the flux values are taken before the binning process is begun.

A description of the columns written (taking again the spatial coordinate as the example) is as follows:

- FLUX_MID: th value given by to the power of
where is taken from column FLUX.
- Y_DIFF: the bin-averaged value of Y - SIM_Y.
- Y_DIFF_STDDEV: for each bin, the standard deviation of the values of Y - SIM_Y which fall within that bin, according to the formula
where and is the number of values within the bin. is of course undefined for .

- Y_DS_ERR: a rough estimate of the uncertainty of Y_DIFF_STDDEV, derived by dividing Y_DIFF_STDDEV by the square root of the number of values in the bin.
- Y_AVE_ERR: this is the simple mean of values of the input source list column Y_ERR which fall within the histogram bin.

XMM-Newton SOC -- 2021-11-30