Set the number of summed points used in volume integration of a given spin in a spectrum.
N: The number of points used by the summation volume integration method.
spectrum_id: The spectrum ID string.
spin_id: Restrict setting the number to certain spins.
For a complete description of which integration methods and how many points N are used for different integration techniques, please see the spectrum.error_analysis user function documentation.
The spectrum ID identifies the spectrum associated with the value of N and must correspond to a previously loaded set of intensities. If the spin ID is unset, then the number of summed points for all spins will be set to the supplied value.