% Input definitions:
lam_nom     525[nm]                                  Nominal wavelength
N_hex       10                                       Number of hexapolar rings
N_lam       5                                        Number of wavelengths per order
f_col       100.0[mm]                                Collimator focal length
D           15.0[mm]                                 Collimated beam diameter
F           f_col/D                                  Input focal ratio
NA          0.5/F                                    Input numerical aperture

% Remaining Echelle-dispersion definitions:
T_ech       50[1/mm]                                 Echelle line density
sigma_ech   1/T_ech                                  Echelle line separation

% Wavelength and order definitions:
mlam_const  2*sigma_ech*cos(theta_xdp)*sin(theta_B)  Order number times wavelength constant
m           round(mlam_const/lam_nom)                Echelle diffraction order
lam_B       mlam_const/m                             Actual echelle blaze wavelength

dlam_FSR    lam_B/m                                  Echelle free spectral range
lam_min     lam_B-dlam_FSR/2                         Minimum wavelength (in order m_nom)
lam_max     lam_B+dlam_FSR/2                         Maximum wavelength (in order m_nom)
lam_step    (lam_max-lam_min)/(N_lam-1)              Wavelength step size