Module beam 

The beam before the sample: neutrons per µs of flight time.

Structs

BeamSpline

ln φ(u), the logarithm of the beam per µs at flight time u, as a uniform cubic B-spline in x = ln u over knot_span_us. Faster than that span, ln φ continues from the spline’s value and slope at the first knot with the spline’s mean curvature over the span, so a beam whose curvature changes across the span is continued with its mean; slower, the last interval’s cubic continues. The curve is the beam only over the flight times a fit integrates.