Variation in Fe I transmission with temperature. The plot illustrates three Fe I transmission templates used to emulate the transits. The 4000K template is represented in blue, the 2500 K template in red, and the 2000 K template in black. A discernible trend of increasing transmission depths is observed with escalating temperature, wherein more lines become pronounced and stronger. This enhancement in line strength with temperature increment effectively introduces more structure to the auto-correlation function, elucidating the temperature-dependent behaviour of Fe I transmission in the emulation of transits.