Effect of changing the model parameters on the synthetic light curves for the specific case of GSN 069. We remind that our best-inferred values for the eccentricity of this source is e = 0.1, MBH spin χ = 0.1, and inclination i_EMRI = 10° (shown by grey dashed lines). In each panel, we only vary one parameter at a time. Top left panel: MBH spin changed to χ = 0.9. Top right panel: EMRI eccentricity increased to e = 0.6. Bottom left panel: retrograde EMRI with i_EMRI = 160° (note the different y-scale). Bottom right panel: disc precession is switched off.