Closer look at the different approaches presented in Fig. 1 by taking 6 days presented in Table 1, with their spot distribution in the first column and the faculae distribution in the second column, the apparent radius for approach 1 (black solid lines) and approach 2 (coloured solid lines) in column three, and scatterplots of the apparent radius as a function of wavelength (column four). We refer to the text for details of why those dates were chosen.