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...ng the same y-axis. I'm sure I haven't done this very elegantly, but here goes: frame_model = data.frame(a=test_date,b=test_data_model) frame_A = data.frame(a=test_date,b=test_data_baseA) frame_B = data.frame(a=test_date,b=test_data_baseB) ts_model = ts(frame_model$b) ts_a = ts(frame_A$b) ts_b = ts(frame_B$b) ts.plot(ts_model,ts_a,ts_b,col=c("blue","red","green"),log="y") The problem is that I no longer have the date along the y-axis. How can I get that back? Finally, when I plot the separate time series, the grid() function geneates a grid wher...