Extended Data Table 4 Confidence interval on Chandra ACIS-S count rate

From: A white dwarf accreting planetary material determined from X-ray observations

  1. The 68% and 90% confidence intervals for the source counts (N) given in Extended Data Table 2, which have been converted to a count rate using the 106.33 ks total exposure time for the three standard Chandra energy bands used in this study. Confidence intervals are calculated using the method of ref. 34, which is a Bayesian approach to Poisson statistics in the presence of a background that uses a simple prior on the number of source counts not being negative. All count rate values are given in units of counts per ks, per 1 arcsec aperture.
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