Fig. 1

Comparison of the thermogravimetric analysis curves of tobacco leaves between eight categories. a The DTG curves of averaged four grades of Fujian province. b The DTG curves of averaged four grades of Yunnan province. c The DTG curves of averaged grade B from Fujian and Yunnan province. d The DTG curves of averaged grade X from Fujian and Yunnan province. e The DTG curves of averaged grade C1 from Fujian and Yunnan province. f The DTG curves of averaged grade C2 from Fujian and Yunnan province