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Fig. 3
Top: the function 
representing the effect of a vertically exponential disc on σz for the ratio of vertical scale-heights lj/hi = 0.5 (red), 1 (blue), and 2 (black) for scaled σRz parameters λi/hi = 4 (highest), 8, 16, and 32 (lowest). Bottom: the same for the function 
representing the effect of a constant density.
This figure is made of several images, please see below:
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