{"Species":"Abies alba","Number.of.tree.rings":"132 544","Boundary.line.equation":"y = 131.8 + 1012.6exp(-1.603x) - 16.8078x","Source":"(Splechtna,  Gratzer & Black 2005)"}
{"Species":"Abies alba","Number.of.tree.rings":"33 549","Boundary.line.equation":"y = 266.138 + 2827.365exp(-3.259x) - 44.963x","Source":"(Nagel,  Levanic & Diaci 2007)"}
{"Species":"Betula alleghaniensis","Number.of.tree.rings":"4 491","Boundary.line.equation":"y = 1257.7exp(-1.16x)","Source":"(Webster & Jensen 2007)"}
{"Species":"Fagus sylvatica","Number.of.tree.rings":"94 649","Boundary.line.equation":"y = 2801.0799exp(-5.4058x) + 488.6093exp(-0.7466x)","Source":"(Splechtna,  Gratzer & Black 2005)"}
{"Species":"Fagus sylvatica","Number.of.tree.rings":"53 324","Boundary.line.equation":"y = 10.089exp(-1.289x) + 1.959exp(-0.336x)","Source":"(Ziaco et al. 2012)"}
{"Species":"Fagus sylvatica","Number.of.tree.rings":"80 539","Boundary.line.equation":"y = 18.040exp(-4.112x) + 4.797exp(-0.454x)","Source":"(Ziaco et al. 2012)"}
{"Species":"Fagus sylvatica","Number.of.tree.rings":"19 833","Boundary.line.equation":"y = 45.9429 + exp(7.58466-2.4772x)","Source":"(Samonil et al. 2009)"}
{"Species":"Fagus sylvatica","Number.of.tree.rings":"20 670","Boundary.line.equation":"y = 2242.78exp(-5.06x) + 418.24exp(-0.88x)","Source":"(Trotsiuk,  Hobi & Commarmot 2012)"}
{"Species":"Larix decidua","Number.of.tree.rings":"3 830","Boundary.line.equation":"Y = 204.78 - 153.16ln(x)","Source":"(Zielonka et al. 2010)"}
{"Species":"Picea abies","Number.of.tree.rings":"147 949","Boundary.line.equation":"y = 130.8732 + 1399.4031exp(-2.4804x)  - 17.2694x ","Source":"(Splechtna,  Gratzer & Black 2005)"}
{"Species":"Picea abies","Number.of.tree.rings":"8 194","Boundary.line.equation":"Y = 338.83 - 257.15ln(x)","Source":"(Zielonka et al. 2010)"}
{"Species":"Picea abies","Number.of.tree.rings":"unknown","Boundary.line.equation":"x = 530.69exp(-1.4626y)","Source":"(Szewczyk,  Szwagrzyk & Muter 2011)"}
{"Species":"Picea abies","Number.of.tree.rings":"unknown","Boundary.line.equation":"x = 308.49exp(-0.7713y)","Source":"(Szewczyk,  Szwagrzyk & Muter 2011)"}
{"Species":"Picea glauca","Number.of.tree.rings":"102 306","Boundary.line.equation":"y = 649.97exp(-1.0798x)","Source":"(Black et al. 2009)"}
{"Species":"Picea mariana","Number.of.tree.rings":"49 007","Boundary.line.equation":"y = 407.92exp(-1.4679x)","Source":"(Black et al. 2009)"}
{"Species":"Pinus echinata","Number.of.tree.rings":"74 925","Boundary.line.equation":"y = 998.65exp(-1.0237x)","Source":"(Black et al. 2004)"}
{"Species":"Pinus palustris","Number.of.tree.rings":"32 970","Boundary.line.equation":"y = 1728.5exp(-0.9735x)","Source":"(Bhuta et al. 2008)"}
{"Species":"Pinus ponderosa","Number.of.tree.rings":"157 243","Boundary.line.equation":"y = 655.97exp(-0.9354x)","Source":"(Black et al. 2004)"}
{"Species":"Pinus strobus","Number.of.tree.rings":"72 714","Boundary.line.equation":"y = 501.96exp(-0.664x0","Source":"(Black & Abrams 2003)"}
{"Species":"Pseudotsuga menziesii","Number.of.tree.rings":"172 372","Boundary.line.equation":"y = 569.80exp(-0.928x)","Source":"(Black et al. 2009)"}
{"Species":"Quercus alba","Number.of.tree.rings":"164 867","Boundary.line.equation":"y = 527.22exp(-0.787x)","Source":"(Black et al. 2004)"}
{"Species":"Quercus macrocarpa","Number.of.tree.rings":"92 092","Boundary.line.equation":"y = 511.27exp(-0.7018x)","Source":"(Black et al. 2004)"}
{"Species":"Quercus mongolica","Number.of.tree.rings":"30 377","Boundary.line.equation":"y = 195.73-153.9ln(x)","Source":"(Altman et al. 2013a)"}
{"Species":"Quercus petraea","Number.of.tree.rings":"45 755","Boundary.line.equation":"y = 5.0067exp(-0.664x)","Source":"(Altman et al. 2013b)"}
{"Species":"Quercus prinus","Number.of.tree.rings":"35 337","Boundary.line.equation":"y = 742.83exp(-0.9445x)","Source":"(Black & Abrams 2003)"}
{"Species":"Quercus stellata","Number.of.tree.rings":"169 333","Boundary.line.equation":"y = 948.45exp(-1.6188x)","Source":"(Black et al. 2009)"}
{"Species":"Tsuga canadensis","Number.of.tree.rings":"180 708","Boundary.line.equation":"y = 974.54exp(-1.1202x)","Source":"(Black & Abrams 2003)"}