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Dear Paradoxoff, I have stumbled upon this post trying to find a solution to my small problem related to the plotting of the z values. I have a method to create 2D histograms based on an DefaultXYZDataset, an XYBlockRenderer and a PaintScaleLegend as you suggested, and it works fine, thank you! But,...

Thanks for your answer! Now it works fine!!! I have added for the 12 hours as you have suggested.

(Please disregard the previous edition of this post, it was my mistake, I have screwed up the dataset while editing and it was producing strange results)

Hi! Thanks a lot for the JFreeChart, it is really amazing! I am using it to create a block chart like this using an XYZDataset, XYBlockRenderer and XYPlot (each row is a spectrum acquired every twelve hours): http://img.photobucket.com/albums/v673/kirrr/QCTrend.png but then I wanted to change the Y ...