“…References describing in detail the equations and methods listed in these tables can also be found in various book chapters and review articles: to cite just a few, for example, Zwicker,20 LochteHoltgreven, 21 Cabannes and Chapelle, 22 Mermet, 28 Blades, 29,30 van der Mullen, [32][33][34] Konjevic,43,56 Konjevic and Roberts, 92 Eddy, 93 Fincke, 94 Jonkers et al, 95 and Calzada. 96 With regard to the articles cited, they can be divided into broad categories dealing with population distributions and deviations from equilibrium, [97][98][99][100][101][102][103][104][105][106][107][108][109][110] classification of diagnostic methods, 111,112 local and space-integrated intensity definitions, 113,114 ion-toneutral ratios and their diagnostic relevance, [115][116][117][118][119][120][121][122][123][124][125] line-to-continuum ratios, …”