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Common Pattern chromatogram of the three herbal medicines A: Radix Paeonia Alba (common peaks: 9-3, 12-5, 13-6, 22-8, 32-11, 20, 24, 25, 27, 33-unknown); B: Radix Paeonia Rubra (common peaks: 12-6, 34-8, 40-unknown, 53-11); C: Cortex Moutan (common peaks: 9-3, 17-6, 31-8, 39-9, 40-10, 43-11, 14, 18, 25, 32, 33, 35, 37-unknown,); D: common peaks of the three herbal medicines
