Fig. 6
From: Land snail shell morphology as a new Paleomonsoon proxy

Spectral analysis results for RWs (red lines) and related palaeoclimate records (grey lines). (a) RW1 and the composite Chinese speleothem δ18O record6. (b) RW2 and paleoprecipitation reconstructed from the Sr/Ca ratio of loess microcodium10. (c) RW3 and land surface paleotemperature reconstructed from brGDGTs in loess50. (d) RW4 and Earth orbital eccentricity. In all panels, the yellow lines indicate the 90% confidence level and the labeled dashed lines denote primary orbital frequencies (frequency = 1/period in kyr).