Radiometric calibration factors as a function of the radial distance of the star images from the center of the occulter. The solid red line is the average value of ${\overline{ϵ}}_{UV}$. The red dashed lines depict the 1σ uncertainty of the in-flight radiometric factors. The green solid line represents the theoretical value according to the scaling of the UVDA tensions (see the text for details). The vertical black solid line is the radius of the internal occulter in pixels.