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. 2019 Aug 8;9:11517. doi: 10.1038/s41598-019-47973-0

Figure 3.

Figure 3

Spatial contours of (a) solution pH and (b) aqueous urea concentrations within the stimulation tank from Day 1 to Day 2 and Day 3 to Day 4, and (c) the relationship between solution pH and urea concentration for all measurements from the stimulation tank during stimulation.