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Polydispersity of 0 does not reproduce monodisperse result #3506

@dehoni

Description

@dehoni

When Polydispersity is enabled, the default value is with PD set to 0. Calculating the model with these value does not create the monodisperse scattering for all distributions.
Only after calculating a model with a PD unequal to 0 and then returning to PD=0 the monodisperse scattering is obtained.
I have tried initializing the default values by just entering the default values, but the behaviour stays the same:
One has to create a model with PD>0 before PD=0 gives the correct result.

Screenshots
Below are images with the expected monodisperse scattering for a sphere model and the observed result with the polydispersity option set on and the default PD=0.

  • Version: [6.1.0]
  • OS: [Windows 11]
  • Installed: [Windows installer]
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