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Calculates the axial and the height chromatisms of a thins lens for an object at infinity as functions of the object height (defined by an angle as the object is at infinity), the focal length and the constringence. The spectral range considered is between 486.13 microns (blue hydrogen line) and 656.27 microns (red hydrogen line). The focal length is considered at 587.56 microns (yellow helium line). Therefore, the parameter yi is calculated at this wavelength.