Fig. 8From: Fingerprint analysis of phenolic acid extract of Salvia miltiorrhiza by digital reference standard analyzer with one or two reference standardsResults of sample tests on column 21 [Agilent TC-C18(2)]. a The result of the RRT method, b The result of the LCTRS method, c The result of the RRT + PDA method, d The result of the LCTRS + PDA methodBack to article page