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Fig. 10. Example of variation over time of standard deviation (SD) values for the EnviroSCAN system. Data are for air-dry soils. The SD (top) is calculated using all data values beginning with zero time and continuing until the time at which the data are plotted. The Running SD is the SD for four consecutively acquired values beginning at each time (bottom) at which the data are plotted; it shows a periodic temperature effect.
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