qcustomplot QT curve he kinked line in chart 1 represents this pattern

plots\balboa.jpg
.....\debug\moc_mainwindow.cpp
.....\.....\moc_qcustomplot.cpp
.....\.....\plot-examples.exe
.....\.....\plot-examples.ilk
.....\.....\plot-examples.pdb
.....\GeneratedFiles\ui_mainwindow.h
.....\main.cpp
.....\mainwindow.cpp
.....\mainwindow.h
.....\mainwindow.ui
.....\plot-examples.pro
.....\plot-examples.sdf
.....\plot-examples.sln
.....\plot-examples.v11.suo
.....\plot-examples.vcxproj
.....\plot-examples.vcxproj.filters
.....\plot-examples.vcxproj.user
.....\plot-examples.vcxproj.vspscc
.....\solarpanels.jpg
.....\sun.png
.....\Win32\Debug\CL.read.1.tlog
.....\.....\.....\CL.write.1.tlog
.....\.....\.....\custombuild.read.1.tlog
.....\.....\.....\custombuild.write.1.tlog
.....\.....\.....\link-cvtres.read.1.tlog
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.....\.....\.....\link-rc.read.1.tlog
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.....\.....\.....\link.read.1.tlog
.....\.....\.....\link.write.1.tlog
.....\.....\.....\main.obj
.....\.....\.....\mainwindow.obj
.....\.....\.....\moc_mainwindow.obj
.....\.....\.....\moc_qcustomplot.obj
.....\.....\.....\plot-examples.Build.CppClean.log
.....\.....\.....\plot-examples.lastbuildstate
.....\.....\.....\plot-examples.log
.....\.....\.....\qcustomplot.obj
.....\.....\.....\vc110.pdb
.....\.....\Debug
.....\debug
.....\GeneratedFiles
.....\Release
.....\Win32
plots

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