As can be seen from Figure 2(a) , with the increase in steaming times, the number of peaks has no significant change, but the content, especially peak 1, exhibits an increasing trend.
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Changes in the Chemical Components of Processed Rehmanniae Radix Distillate during Different Steaming Times.
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The sentences
Further processing gradually decreased or showed a peak followed by a decreasing trend.
Other compounds, however, exhibited a negative trend or fluctuated.