LARS01: panel A: Surface brightness and color profiles with elliptical and isophotal integration. Where possible, a one-dimensional (1D) fit to the region μ_B = 26–28 mag arcsec⁻² is shown (dotted line). Panel B: RGB image with (red, green, blue) = (I,  B,  U) bands. Panel C: U−B color map. Panel D: deep contours with varying isophotal levels and showing the center of integration (cross). Panels E, F: Color–color diagrams showing the radial color profiles (gray crosses), the total integrated color (filled black circle), instantaneous burst model (green solid line), a model with decaying SFR of e-folding time 1 Gyr (blue solid line), a mixture of two stellar populations (red solid line), pure gas emission from an instantaneous burst (gray solid line) and a dust attenuation arrow for E(B − V ) = 0.1. Panel G: Yggdrasil model mass-to-light radial profiles from Sect. 3.7. Also indicated are the FUV r_cut radius (vertical dashed line) and the M/L used to estimate the stellar mass of the outskirts (circle if no radial overlap, solid black line if radial overlap, gray dashed line for average).