zebra.brn(arg0: numpy.ndarray[numpy.float64], arg1: numpy.ndarray[numpy.float64], arg2: numpy.ndarray[numpy.float64], arg3: numpy.ndarray[numpy.float64], arg4: numpy.ndarray[numpy.float64], arg5: numpy.ndarray[numpy.float64], arg6: numpy.ndarray[numpy.float64], arg7: numpy.ndarray[numpy.float64]) → None

Computes the bulk richardson number.