PNG  IHDR TcsBITO)PLTE@@@ `@` 0`@@@@``````@```` ``` @@ @` ```@ ```@@@``` @@ @```@@`p 7StEXtSoftwaregnuplot version 3.7 patchlevel 2 on Linux 2.4.20-3-pentium4-smp-mem64-rmapi'IDATx흋0 DG