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I'm trying to draw a graph, given in this simple tutorial: https://www.arduino.cc/en/Tutorial/Graph. I'm using the Arduino IDE 1.6.5 and Processing 3.0b5. Still NO graph appears. When I insert "println" commands in the Processing-code, I can tell that Processing is recieving data, and has the correct coordinates in order to draw the lines, but no lines appear. It is as though the Line-command is out of function in the void serialEvent. Please help.