Faint Lyα isophotes used to study the extent of the Lyα halo through the isophotal approach for each galaxy. In each figure, in the top panels, the region within the isophotal levels of even multipliers (1, 2, 3, 4) of the faintest limit (1.5 × 10³⁹ erg s⁻¹ kpc⁻², except J1156 5.0 × 10³⁹ erg s⁻¹ kpc⁻²) denoted by red, orange, green and blue contours, all displayed on the Lyα maps of the galaxies. Bottom panels: data points corresponding to these isophotes displayed with the same colour, and a single exponential fit (Eq. (9)) to the points. The fitted scale lengths (and the measured error bar determined from the fit) are given in the lower left corner. The blue diamond represents the measured Lyα SB in the binned images at the innermost region (usually within r = 0.1 kpc from the brightest FUV point).