PNG IHDR , sBITO )PLTE @@ @ ` @ ` 0`@@@@ ` ```` ` @`` ` ` ``` @@ @` ```@ ` ` `@ @@` `` @ @ @`` ` @@`p 7 ?tEXtSoftware gnuplot version 3.7 patchlevel 2 on Linux 2.4.18-1-686x PIDATx휁r8Ey%P @@`q-r&%đ}B pS?vO6˯]FnYi~yv͘hWYow81u?'n]?>d2pYF$dyv-e ˫͗L06YSK F攥