The stomatal fraction of ozone dry deposition aggregated from estimates from field sites in previous literature. The number of data points in each composite is to the right of the respective box and whiskers plot. Not all datasets reporting spring, summer, fall, or winter stomatal fraction estimates provide an annual estimate, and thus the annual estimate is lower than the estimate for each season. The bottom of the box is the 25th percentile of the data, middle is the median, and the top is the 75th percentile. The error bars indicate maximum and minimum values not considering outliers (red symbols). Outliers are defined as values >1.5x the interquartile range of the 25th to 75th percentiles. Sites and references included are Auchencorth Moss (Fowler et al., 2001), Bergamo (Gerosa et al., 2003), Bily Kriz (Juráň et al., 2019; Zapletal et al., 2011), Blodgett Forest (Ducker et al., 2018; Fares, McKay, Holzinger, et al., 2010; Goldstein, 2003; Kurpius & Goldstein, 2003), Bondville (Zhang, L., et al., 2006), Braunscheig ( Mészáros, Horváth, Weidinger, et al., 2009), Bugacpuszta (Horváth et al., 2017), Burriana (Cieslik, 2004), Cadenazzo (Bassin et al., 2004), Cala Violina (Cieslik, 2009), Camp Borden (Fuentes et al., 1992), Castelporziano (Cieslik, 2004, 2009; Gerosa et al., 2005; Gerosa, Finco, Mereu, et al., 2009a,b; Fares et al., 2014; Hoshika et al., 2017; Savi & Fares, 2014), California Ozone Deposition Experiment (CODE) cotton (Grantz et al., 1997), CODE vineyard (Grantz et al., 1995), Comun Nuovo (Bassin et al., 2004; Cieslik, 2009), Cuatro Vientos (Cieslik, 2004), Diepoholz (El-Madany et al., 2017), Flanders (Neirynck et al., 2012), Gilchriston Farm (Coyle et al., 2009), GLEES Brooklyn Lake (Zeller & Nikolov, 2000), Grignon (Stella, Personne, Lamaud, et al., 2011; Stella et al., 2013), Hartheim (Joss & Graber, 1996), Harvard Forest (Clifton et al., 2017; Ducker et al., 2018), Hyytiälä (Altimir et al., 2006; Ducker et al., 2018; Launiainen et al., 2013; Rannik et al., 2012; Zhou, P. T., et al., 2017), Ispra (Cieslik, 2004), Kaamanen (Tuovinen et al., 1998), Kane Experimental Forest (Zhang, L., et al., 2006), Klippeneck (Cieslik, 2004), Kranzberger Forst (Nunn et al., 2010), La Cape Sud (Stella, Personne, Lamaud, et al., 2011), Le Dézert (Cieslik, 2004), Les Landes (Lamaud et al., 2002), Lincove (Fares et al., 2012), Lochristi (Zona et al., 2014), Central Plains Experimental Range (Massman et al., 1993), Nashville (Zhang, L., et al., 2006), Niwot Ridge (Turnipseed et al., 2009), Polder Piloto de Sarazola (Pio et al., 2000), Ramat Hanadiv Nature Park (Li, Q., et al., 2018), Rhineland-Palatinate (Plake, Stella, Moravek, et al., 2015), Rivox (Coe et al., 1995), S. Pietro Capofiume (Cieslik, 2004, 2009), San Rossore (Hoshika et al., 2017), Sand Flats State Forest (Zhang, L., et al., 2006), Sand Mountain (Zhang, L., et al., 2006), Sinderhoeve (Van Pul & Jacobs, 1994), Speulderbos (Dorsey et al., 2004), Ulborg (Mikkelsen et al., 2004), UMBS Prophet (Hogg, 2007; Hogg et al., 2007), Viols-en-Laval (Cieslik, 2004), and Voghera (Cieslik, 2004, 2009; Gerosa et al., 2007).