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...panel.superpose). I have tried to do this manually using panel.line, but panel.line will not draw to the left of the y-axis (or on the y-axis for that matter). I would prefer not to have to do this by hand, but I feel like I am running out of options. The figure can be viewed here (http://threeridge.usc.edu/ Figure1.revised.pdf). The solid, green, horizontal line above the 20000 tick is where I would like to draw the break. NB, this solid, horizontal line should extend beyond the y-axis to the left, but is clearly cut off. I can post the source if necessary. Thanks, Jason [[alter...