Figure 2

Spatial distribution of the relative extreme-temperature indices: the numbers of (a) cool nights (TN10), (b) cool days (TX10), (c) warm nights (TN90), and (d) warm days (TX90). The descriptions of the indices are shown in Supplementary Table S1. Increasing trends are shown as the green symbols, decreasing trends as white symbols. The station points with the background of yellow color represent significance (F test, P < 0.05).