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Figure 1  .

Figure 1  

Evacuation of intestinal gas in patients with irritable bowel syndrome (IBS) (n=20) and healthy subjects (n=20). Gas was infused into the intestine at a constant rate (represented by the broken line) for two hours and collected via an anal cannula. Note that IBS patients expelled a significantly lower volume of gas. Values are means (SEM). **p<0.01.