both show decreased amplitudes in the water band while HD203030B shows a marginal enhancement in amplitude in the water band. Furthermore, the water band variability amplitude of PSO J318.5-22 appears to change between two rotations - initially showing a suppressed amplitude followed by an amplitude similar to the continuum amplitude the following rotation [@Biller2018]. @Miles-Paez2019 suggest that this may be due to an increased height differentiation between the condensate cloud layers and the high altitude water and carbon monoxide layer in low-gravity objects. This would result in higher variability amplitudes for the young objects in wavelength regions that are relatively free of water and carbon monoxide gas species. Enhanced variability amplitudes have indeed been observed in the $J$-band [@Vos2019]. In the mid-IR however, we tentatively observe enhanced amplitudes in late-L low-gravity objects at $4.5~\mu$m but not at $3.6~\mu$m. More extensive mid-IR monitoring programs will be essential to statistically compare the amplitudes between the two populations at $3.6~\mu$m and $4.5~\mu$m.

![image](amplitude_ratios-eps-converted-to.pdf)

Figure \[fig:amplitude\_ratios\] shows variability amplitude ratios ($A_{J}, A_{3.6}, A_{4.5}$) measured for low-gravity and field L dwarfs. The brightness temperature of L dwarf atmospheres is strongly dependent on wavelength, and the variability amplitude ratios in the near and mid-IR have been 