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BEHR update

BEHR (Bayesian Estimation of Hardness Ratios) is a C program designed to compute hardness ratios – summary statistics of a spectrum for faint X-ray sources – while explicitly modeling the arrival of photons as an inhomogeneous Poisson process and properly accounting for background contamination.

In the previous versions of BEHR, users are allowed to choose only the gamma prior distribution that is parametrized in terms of an index (shape) parameter and a scale parameter. But there was need for using a tabulated prior distribution that does not necessarily look like a gamma distribution. The use of a tabulated prior distribution gives us two advantages:
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