Figure 3
From: Sensitivity of speleothem records in the Indian Summer Monsoon region to dry season infiltration

CWTs of (a). Sohra rainfall (http://climexp.knmi.nl), (b) δ18O, (c) Mg/Ca, and (d) U/Ca in MAW-0201. Signals outlined in black are significant at the 95% confidence interval, more yellow colors signify a stronger periodicity. The black dotted box represents the period of positive PDO index and coincides with significant changes in signal strength.