**Definition:**

The figure of merit m for this reflection. int P~alpha~ exp(i*alpha) dalpha m = -------------------------------- int P~alpha~ dalpha P~a~ = the probability that the phase angle a is correct int is taken over the range alpha = 0 to 2 pi.

**Type:** float

**Mandatory item:** no

The permitted range is [0.0, infinity)

**Category:** refln

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