PNG IHDR t 9tEXtSoftware Matplotlib version3.3.4, https://matplotlib.org/T̺ pHYs a a?i IDATxwXW{ATbWA` [5hQE4^b[]Dh{Iuwazk/3<33DQADDDDDDDDDDDy"+ Jvvvvvvvvvvvvvv GGC%GGGP