Fig. 4: Quantile regression slopes for NHW in relation to moisture-related variables in winter before.
From: Inter-seasonal connection of typical European heatwave patterns to soil moisture

NHW versus mrsosJFMA (a) and prJFMA (b). Statistically significant slopes with a 90% confidence level with a two-sided t-test are identified with black edge. mrsosJFMA for the 25 years with the highest number of heatwave days in chosen patterns with significant precipitation anomalies (c).