Maps of the large-scale magnetic field of ι Hor (in latitude-longitude equi-rectangular projection) favouring symmetry during the ZDI reconstruction for Epochs 1 to 12. Columns contain the radial (B_R, left), azimuthal (B_A, middle), and meridional (B_M, right) field components, with the color scale indicating the magnitude (in gauss) and field polarity in each case. Each row corresponds to a different observing epoch, as indicated in the bottom right, with the observed phases denoted by black tick marks in longitude (upper x-axes). The campaign day and number of stellar rotations (measured from BJD = 2457300.78580 to the first night of observations of a given epoch) are listed on each map. The segmented line shows the visibility limit imposed by the inclination of the star (i = 60 deg).