Figure 4

Receiver operating characteristic curve, (a) atractylodin content is higher the standard of Pharmacopeia, (b) atractylodin content is lower than the standard of Pharmacopeia. Generated using the Maxent version 3.3.3 k software (AT&T Labs–Research, Florham Park, NJ, USA. URL: http://www.cs.princeton.edu/~schapire/maxent/).