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The function diff_mode selects one of the following modes:
0 bissector_vertical 1 constant_omega_vertical 2 constant_chi_vertical 3 constant_phi_vertical 4 lifting_detector_phi 5 lifting_detector_omega 6 lifting_detector_mu 7 double_diffraction_vertical 8 bissector_horizontal 9 double_diffraction_horizontal 10 psi_constant_vertical
It is called like:
$ret = Spectra::diff_mode(10);
$ret = Spectra::diff_mode();
The function diff_asn selects/return the number of the selected set of angles
(SOLEIL: Anglesidx):
$ret = Spectra::diff_asn(1);
$ret = Spectra::diff_asn();