#767 closed defect

Sum/Product Models don't do what they claim — at Initial Version

The Sum|Multi model generator is not creating properly parameterised models:

Sum
Should do: scale_factor * {(scale_1 * model_1) + (scale_2 * model_2)} + background

Is doing : scale_factor * {(scale_1 * model_1 + b/g_1) + (scale_2 * model_2 + b/g_2)}

Product

Should do: scale_factor * model_1 * model_2 + background

Is doing : (scale_1 * model_1 + b/g_1) * (scale_2 * model_2 + b/g_2) + background

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