improvements for 1.5.2

mne/preprocessing/maxwell.py

@@ -10,7 +10,7 @@ from pathlib import Path
 
 import numpy as np
 from scipy import linalg
-from scipy.special import lpmv, sph_harm
+from scipy.special import lpmv, sph_harm_y
 
 from .. import __version__
 from .._fiff.compensator import make_compensator
@@ -1487,7 +1487,7 @@ def _sss_basis_basic(exp, coils, mag_scale=100.0, method="standard"):
             S_in_out = list()
             grads_in_out = list()
             # Same spherical harmonic is used for both internal and external
-            sph = sph_harm(order, degree, az, pol)
+            sph = sph_harm_y(order, degree, az, pol)
             sph_norm = _sph_harm_norm(order, degree)
             # Compute complex gradient for all integration points
             # in spherical coordinates (Eq. 6). The gradient for rad, az, pol