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Scanning electron microscope images of Codonopsis pilosulae with different drying methods. The magnification was set as 500×. ND: natural drying; RMVD: rotary microwave vacuum drying; RFVD: radio frequency vacuum drying; VD: vacuum drying; VFID: vacuum far infrared drying. (a) ND; (b) VFID; (c) RFVD; (d) HD; (e) RMVD; (f) VD.
