claim: Nymphomaniac (film) is not an installment in a trilogy.
evidence: Haines Index -LRB- also known as Lower Atmosphere Severity Index -RRB- is a weather index developed by meteorologist Donald Haines in 1988 that measures the potential for dry , unstable air to contribute to the development of large or erratic wildland fires .. meteorologist. meteorologist. The index is derived from the stability -LRB- temperature difference between different levels of the atmosphere -RRB- and moisture content -LRB- dew point depression -RRB- of the lower atmosphere .. dew point depression. dew point depression. atmosphere. atmosphere. These data may be acquired with a radiosonde or simulated by a numerical weather prediction model .. radiosonde. radiosonde. The index is calculated over three ranges of atmospheric pressure  : low elevation -LRB- 950-850 millibars -LRB- mb -RRB- -RRB- , mid elevation -LRB- 850-700 mb -RRB- , and high elevation -LRB- 700-500 mb -RRB- .. A Haines Index of 6 means a high potential for an existing fire to become large or exhibit erratic fire behavior , 5 means medium potential , 4 means low potential , and anything less than 4 means very low potential .