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...nced, so that the tickmarks and the lables for the axis must not evenly distributed. A regular grid via the 'grid' function aligns perfectly with the image cells, but the tickmarks via "axis" are slightely shifted, and not aligned perfectly with the image cells. The offset is even stonger for the y-axis. The thing is that I don't want 84 lables at the axis, it's enough to have one lable for all the different factor level combinations, which results in 28 labels. Maybe you have an idea how to setup the command to align the tick marks properly. thanks for your help, kind r...