id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
cet-12805		cet-12805		6	.pdf	application/pdf	3219	112	42	As shown in Figure 2, the spectral correction leads to peak concentration values significantly higher than those obtained by using the sample variance as measured by the instrument (Figure 2 concentration-axis scale is logarithmic). 2.1 Definition of peak concentration and its determination The instantaneous concentration c(t) of a gas in the PBL can be considered as a stationary stochastic process whose statistical properties are completely defined by a probability density function (PDF) that has to be determined experimentally (see, e.g., Cassiani et al., 2020 for a review), and is well described by a Gamma distribution (Nironi et al. 2015).	cache/cet-12805.pdf	txt/cet-12805.txt