[Maxima] plotting abs(log(x))

[Michele Minelli]

Hi everyone,
I was trying to plot y=abs(log(x)) with

/plot2d(abs(log(x)), [x, -10, 10]);/

and I realized that Maxima plots a curve even for x less than zero. 
Could someone explain me why (I remember reading it once but I couldn't 
find it anymore) and how to disable this representation if I want?
Thank you.

Michele Minelli
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