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Calculates the axial and the height chromatisms of a real lens as functions of the refraction indexes, the surfaces radii, the center thickness, the object height and the object position.

When a glass reference is used instead of refraction index values, the chromatism is calculated using the chosen glass reference and in the spectral range going from lam_min to lam_max. lam_min and lam_max are defined in the page General parameters/Wavelengths.