Results of the ZDI analysis for the first-epoch observations of HD 1237 using the Gaussian line profile. The first three panels show the surface magnetic field components B_R, B_M, and B_A. The colour scale indicates the polarity and the magnitude of the magnetic field component in G, while the phase coverage is indicated by the black ticks in the upper y-axis. The segmented horizontal line indicates the surface visibility limit, imposed by the adopted inclination angle of the star (i = 50°). The last panel shows the comparison between synthetic (red) and observed (black) Stokes V profiles obtained for this particular epoch in each observational phase Φ, where the recovered maps fit the spectro-polarimetric data to an optimal reduced χ² = 1.4.