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this function presents a solution of quadratic equation which has two roots. The root is selected depending on sign of theta angle...
This function is parameterized catheterized in python script fiber_angles.py and can be plotted for different angles:
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Solutions: y1=-B+sqtr(B^2-C) and y2=-B-sqtr(B^2-C):
Similar function is used in data processing to fit peak (x,y) positions in equatorial region and use two angles as a fit parameters.
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