PNG IHDR t 9tEXtSoftware Matplotlib version3.3.4, https://matplotlib.org/T̺ pHYs a a?i IDATxwxSwKZfeɖ-قP( C2De*EQp Ed"[LdOٖΜ%^頟uJrs4M<a""""""""""".Y@ wHP]DDDDDDDDDD$(.""""""""""p Jd %EDDDDDDDDDD2"""""""""""@ wHP]DDDDDDDDDD$(.""""""""""p J