% White Pupil Echelle Spectrograph parameters:
N_hex        10                                       Number of hexapolar rings

% Optical axis directions:
xi           sin(theta_i)                             Input optical axis, x-component
yi           0                                        Input optical axis, y-component
zi           cos(theta_i)                             Input optical axis, z-component

% Remaining spectrograph definitions:
F            f_1/B                                    Input focal ratio
NA           0.5/F                                    Input numerical aperture
T_ech        31.6[mm^-1]                              Echelle grating line frequency
sigma_ech    1/T_ech                                  Echelle grating line spacing

% Wavelength and orders
mlam         2*sigma_ech*cos(gamma_ech)*sin(theta_B)  Order number times wavelength constant
lam_min      450[nm]                                  Nominal minimum wavelength
lam_max      600[nm]                                  Nominal maximum wavelength
m_max        round(mlam/lam_min)                      Maximum order number
m_min        round(mlam/lam_max)                      Minimum order number
m_mid        (m_max+m_min)/2-2                        Middle order number