Ca/Ar and Fe/S FIP bias calculated at positions along the loop marked in the Fe XVI 262.98 Å map at 18:39 UT. Vertical bar at each data point indicates an error of 0.3. Data points with insufficient χ² or poor fit are omitted. A correlation between composition and loop position is observed. The loop top exhibits high FIP bias, indicative of fractionated plasma. In contrast, the footpoints show photospheric abundances with the Fe/S diagnostic, and even inverse-FIP abundance with the Ca/Ar diagnostic.