

 Dear All: 

I have the following data: 

	0                		100
	  0.5		                79.9605
	0.75		                  84.7098
	1.5		                 72.1793
	2.5		                 97.4924
	4.5		                 90.9696
	8.5		                59.9794
	24.5		                76.4859
	456		               100.0000
	457.5		                 116.7381
	460.5		                118.7550
	464.5		               89.5898
	480.5		                 86.3348 

left column is time and right column is concentration, I would like to plot all data on one plot, however, if I specify xlim=c(0,500), there will be a very long distance between points 24.5 and 456, what i am thinking is to make two days(0 and 19 days) very close on the plot and use a kind of "//" sign on the x axis to seperate the x axis. no work needed on Y axis. I hope I clarify my question and thank you very much for your consideration and help in your busy time. 

Zheng 

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