between 250-300 ppm is assumed to be an average normal concentration, this is a reference range compared against the observed concentration of a subject plant tissue. This is a scientifically mandated condition with respect to phytophysiological experimentation. These datum are detected with a simple benchtop infrared spectrum gas analyzer. [IRGA]
An investigation of extreme rigor, or extreme contention must use instruments of higher accuraccy and selectivity, at great expense of course, and exacting grant proposals as a result.
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