Figure 3 in Temperature variation and the presence of troglobionts in terrestrial shallow subterranean habitats

Figure 3. Top panel, temperature profiles at hourly intervals for the La Guancha, 70 cm MSS site (black line) and Cueva del Mulo (grey line). Centre panel, spectral densities (y-axis) for different cycle periods (x-axis) for cycles up to 100 days for the MSS site. Note the absence of a 24 hour period even at very low spectral densities. Bottom panel, spectral densities (y-axis) for different cycle periods (x-axis) for cycles up to 100 days for the cave sites. Note the weak 24 hour period.