Infrared spectral lines of ϵ Eridani observed with SPIRou (black points) and modelled with ZEEMAN. The wavelength of lines is shown as green vertical ticks, and the effective Landé g factors are indicated to the right of each modelled line name. The best two-component magnetic model (blue) provides an acceptable fit to all lines, while a model with no magnetic field but otherwise the same parameters (red) only fits the magnetically insensitive line (top right panel). A multi-component model (orange) provides a comparable fit to the two-component model. The observation before telluric correction (dashed line) is shown for reference.