R contour levels don't match filled.contour -

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hopefully straightforward question made simple figure in r using filled.contour(). looks fine, , should given data. however, want add reference line along contour 0 (level = 0), , plotted line doesn't match colors on filled.contour figure. line close, not matching figure (and crossing on contour filled.contour plot). ideas why happening?

aa <- c(0.05843150,  0.11300040,  0.15280030,  0.183524400,  0.20772430,  0.228121000) bb <- c(0.01561055,  0.06520635,  0.10196237,  0.130127650,  0.15314544,  0.172292410) cc <- c(-0.02166599,  0.02306650,  0.05619421,  0.082193680,  0.10334837,  0.121156780) dd <- c(-0.05356592, -0.01432910,  0.01546647,  0.039156660,  0.05858709,  0.074953650) ee <- c(-0.08071987, -0.04654243, -0.02011676,  0.000977798,  0.01855881,  0.033651089) ff <- c(-0.10343798, -0.07416114, -0.05111547, -0.032481132, -0.01683215, -0.003636035) gg <- c(-0.12237798, -0.09753544, -0.07785126, -0.061607548, -0.04788856, -0.036169540)  hh <-rbind(aa,bb,cc,dd,ee,ff,gg)  z <- as.matrix(hh) y <- seq(0.5,1.75,0.25) x <- seq(1,2.5,0.25)  filled.contour(x,y,z,            key.title = title(main=expression("log"(lambda))),            color.palette = topo.colors) #this works  contour(x,y,z, level=0,add=t,lwd=3) #this line doesn't match plot

this answered in ?filled.contour page. in notes section states

the output produced filled.contour combination of 2 plots; 1 filled contour , 1 legend. 2 separate coordinate systems set these 2 plots, used internally – once function has returned these coordinate systems lost. if want annotate main contour plot, example add points, can specify graphics commands in plot.axes argument. see examples.

and examples given in page show how annotate on top of main plot. in particular case, correct way be

filled.contour(x,y,z,     key.title = title(main=expression("log"(lambda))),     color.palette = topo.colors,     plot.axes = {         axis(1)         axis(2)         contour(x,y,z, level=0,add=t,lwd=3)                  } )

which produces

enter image description here


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