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What is the conversion factor from counts (50% in detect cell) per second to energy flux for a particular spectrum? For example, a Raymond-Smith Plasma with a temperature corresponding to 1 keV and a column of cm (log(N ). The ECF for this spectral model is taken from Table 11.4 of Figure 11.6, it is . That is, a flux of ergs cm s in the ROSAT energy band (0.1 to 2.4 keV) will give a count rate of counts s in the HRI. Inverting this relationship gives the result that 1 count s ergs cm s . In general the conversion factor from counts per second (50% in detect cell) to energy flux is given by: 1 count s /ECF ergs cm s .