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Method

Straightforward, apart from the transformation into the photon space. The model is readily available in this space, but the data have to be transformed. This can only be done approximately, using:

    photon space data = channel data * photon model / channel model

where the channel model is the result of folding the photon space model through the instrument response. Note that the photon space data derived from the same spectrum via different models will be different. The transformation is strictly correct only if the model is correct. Hence photon space plots obtained from poorly fitting models are suspect.

Data errors are transformed into the photon space in exactly the same way as the data.

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