Calculate the width factor corresponding to a given volume coverage fraction.
The factor delimits a rectangular window, and the shape is separable, so the
enclosed volume is the product of the coverage of both axes. Each axis
therefore has to cover the square root of the target volume.
Parameters
volume: number = 0.9999
target volume fraction (0–1). Defaults to 0.9999.
Returns number
the factor by which to multiply fwhm, on each axis, to cover the given volume.
Calculate the width factor corresponding to a given volume coverage fraction. The factor delimits a rectangular window, and the shape is separable, so the enclosed volume is the product of the coverage of both axes. Each axis therefore has to cover the square root of the target volume.