Fig. 3From: Quasi-linear score for capturing heterogeneous structure in biomarkersThe boundary (upper) and contour (lower) of the quasi-linear score. Left and center; F(x 1,x 2)=log(exp(1+x 1)+exp(1+x 2)), the right; G(x 1,x 2)=max(1+x 1,1+x 2). The center panel is an expansion around the origin (0,0) of the left panel Back to article page