## Initialization

Initialization method Description
x = SHMagCoeffs.expand() Initialize using an SHMagCoeffs class instance.

## Class attributes

Attribute Description
rad SHGrid class instance of the radial component of the magnetic field evaluated on an ellipsoid.
theta SHGrid class instance of the theta component of the magnetic field evaluated on an ellipsoid.
phi SHGrid class instance of the phi component of the magnetic field evaluated on an ellipsoid.
total SHGrid class instance of the total magnetic field evaluated on an ellipsoid.
pot SHGrid class instance of the magnetic potential evaluated on an ellipsoid.
a Semimajor axis of the reference ellipsoid.
f Flattening of the reference ellipsoid, f = (a - b) / a.
lmax The maximum spherical harmonic degree resolvable by the grids.
lmax_calc The maximum spherical harmonic degree of the magnetic potential used in creating the grids.
nlat, nlon The number of latitude and longitude bands in the grids.
sampling The longitudinal sampling scheme of the grids: either 1 for nlon = nlat or 2 for nlon = 2 * nlat.

## Class methods

Method Description
plot() Plot all three components of the magnetic field and total magnetic intensity.
plot_rad() Plot the radial component of the magnetic field.
plot_theta() Plot the theta component of the magnetic field.
plot_phi() Plot the phi component of the magnetic field.
plot_total() Plot the total magnetic field intensity.
plot_pot() Plot the magnetic potential.
copy() Return a copy of the class instance.
info() Print a summary of the data stored in the SHMagGrid instance.