Correction to: Few-Body Syst (2021) 62:2 https://doi.org/10.1007/s00601-020-01582-0

The error in Equation (2.33) is now corrected \(X_d=4\), \(X_e=-2\) should be \(X_d=2\), \(X_e=-1\).

The original article has been corrected.