Two-point size and roundness on a circle made of four 30° arcs

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Hello everyone,

Our supplier needs to measure a cylinder with four sections milled away:

The remaining arcs are about 30° wide and spaced 90° apart, so there should always be opposing points.

We want each arc scanned with high point density and the points combined into one circle. From that circle we want to evaluate:
- the two-point size (LP)(SX)/(LP)(SN)
- LSQ-roundness (least squares not minimum zone)

The supplier says neither can be evaluated because the circle is incomplete.

Can Calypso do this or not?
Could someone point me to a setup or example I can pass on to the supplier?

Thanks for any advice!