This package contains the code and the numerical data behind the paper "Net electron spin rotation in a plane-wave pulse: Holonomy set by the anomalous magnetic moment" N. S. Akintsov, A. P. Nevecheria, S. N. Andreev, Qing-Hua Qin. The paper shows that the net rotation of the spin of an electron crossing a plane-wave pulse of finite duration is a holonomy: it equals -(1/2) a_e^2 A, where a_e = (g-2)/2 is the anomalous magnetic moment and A is twice the signed area swept by the vector potential in the polarization plane. The rotation vanishes identically for linear polarization at any g, and it does not depend on the electron energy, the carrier frequency, the pulse duration, the chirp or the carrier-envelope phase. Finite focusing breaks the law at second order in the diffraction parameter eps = 1/(k w0).