}
/* This is a longish function, but we don't separate this out into
neat modular separate subfunctions, as the subfunctions would be
called for many values of YL, YR. By precomputing various
parameters outside of the loop, we can save a lot of time. */
}
/* This is a longish function, but we don't separate this out into
neat modular separate subfunctions, as the subfunctions would be
called for many values of YL, YR. By precomputing various
parameters outside of the loop, we can save a lot of time. */