Partition functions at various temperatures
This section is intended to obtain the dependence of the partition functions of temperature Q(T) in graphical and/or numerical form for all molecules and isotopologues presented on the website. Partition functions are used to calculate values of the spectral line intensities at temperatures different from the reference temperature of the data source (see Generalities).The list of molecules is located in the left part of the viewport (Fig. 1). To select the molecule click over the title of the molecule of your interes.
Fig. 1.The page of partition functions
The right part of the viewport can contain several tabs. The default Survey tab appears immediately after selecting the molecule. This tab contains the table of available isotopologues of selected molecule with their properties such as designation, mass, abundance, the value of the partition functions at Tref=296K and the range of acceptable temperatures. In addition, the leftmost column of the table contains a check boxes that allows you to select the isotopologues for building of graphical dependences Q(T). The graph opens in the Plot tab just after click the Plot selected button. The buttons
and 
in the rightmost column of the table serve to open the tab for view a file of dependencies Q(T) and download this file to the user's computer.
Format of numerical representation
Files displayed in View tabs and downloaded to a user's computer contain several header lines beginning with " # " symbol. Header lines give a verbal description of the file contents and the temperature range in which the values of Q(T) are available. Below are the data columns. The data contains 2 columns. The first one contains the values of the temperature T, and the second one the values of Q(T).