Evolution of AR 13169 with time progressing downward. Left column: SPICE radiance maps seen in the Ne VIII 770 line $({log}_{10}\frac{T}{1\text{K}}=5.8)$. Middle column: Corresponding FIP bias maps seen in the Mg IX/Ne VIII ratio. Right column: Evolution of the FIP bias values, tracking different zones. Note: Time progresses from left to right in the plots of this column, and the offset is used to show error bars more clearly. The dotted black line represents the quiet Sun reference. Bottom right: Ratio of contribution functions for the lines presented. The solid lines represent calculations with a density of n_e = 10⁸ cm⁻³, the dotted lines with n_e = 10⁹ cm⁻³ and the dashed lines with n_e = 10¹⁰ cm⁻³.