|C||The paper that is cited here refers to another reference which could not be obtained (e.g., personal communication, Ph.D. theses, internal papers etc.).|
|E||The value is estimated. Estimates are only listed if no reliable measurements are available for the compound.|
|L||The cited paper is a literature review.|
|M||Original publication of a measured value.|
|R||The cited paper presents a recalculation of previously published material (e.g., extrapolation to a different temperature or concentration range).|
|V||Vapor pressure of the pure substance is used to determine the Henry's law constant.|
|X||The information presented comes from another paper or personal communication.|
|Q||The cited paper doesn't clearly state how the value was obtained.|
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