Histograms of the retrieved phases under high microlensing magnifications of the second SN image and second microlensing scenario using the absorption lines Fe II, Hα, and Hβ. By using the wavelengths of the absorption features, the phase of the second SN image of the second microlensing scenario is correctly recovered. (a) Retrieved phase using the absorption line of Fe II. (b) Retrieved phase using the absorption line of Hα. (c) Retrieved phase using the absorption line of Hβ. (d) Retrieved phase combining all three absorption lines.