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Fix FCS pieciewise linear interpolation lookup at edges

Joshua Falco Beirer requested to merge jbeirer/athena:21.0-FixLinearInterpolFCS into 21.0

This MR fixes a problem, where the interpolation lookup at the edges of logEkin led to ROOT::Math::GSLInterpolator::Eval:0 runtime warnings. This happened because in L39 m_MinMaxlogEkin is casted to float so that the minimum and maxium logEkin values did not exactly correspond to the edges which the interpolation holds.

Edited by Joshua Falco Beirer

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