PNG IHDR t sBIT|d pHYs a a?i 8tEXtSoftware matplotlib version3.2.0, http://matplotlib.org/y IDATxwXSgoCe,(]'RqҺZZgu֪}[[V"uTQAʼnEVDD8@AI @|?%99'ɝ'!LL QU;0NDDDDDDDDDDLDDDDDDDDDDDz;0NDDDDDDDDDDLDDDDDDDDDDDz;0NDDDDDDDDDDLDDDDDDDDDDDz;0NDDDDzs1H$L0D"͛7{xx@"yڵkXlw'''^z:t("""J\vǎѣ`nnubРA8vX?~sW^pww lllмys̙3