c0 = 299792458.0

#xi = int(xi * METERS_TO_STEPS_FACTOR)
#xf = int(xf * METERS_TO_STEPS_FACTOR)
#dx = int((c0  / (4.0 * ff * 1E9)) * METERS_TO_STEPS_FACTOR)
#npos = int(((xf - xi) / dx) + 1.0)
#xf = xi + dx * (npos - 1)
