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λb:a as a function of the VOCs from different types of cancer: (a) lung cancer; (b) breast cancer; (c) colon cance ; (d) liver cancer; (e) head and neck cancer; (f) gastric cancer. Data show that lung cancer, gastric cancer and liver cancer have rather similar values as can be seen from the median line. On the other hand, breast cancer and head and neck cancer are similar and colon cancer is different from the rest.
