Undesired Horizontal Line in Plot

Questions
,
1

Hello, all !
I ask you please to help me.

Some graphics present an insistent
horizontal line that makes me nervous and I cannot eliminate it. It seems to
be a bug. Or I am not able in using the command show correctly…
Files are attached.

Would you help me, please ?

Thanks ,

Scabral

2

I wish I could supply a definite answer but I used to get such lines (usually unexpected vertical lines) when using Mathematica version 9 but the same code does not generate those lines in version 10 (running on Windows 7).

3

Dear Scabral,

The line you see is the horizontal axis which is placed automatically. You can solve this or control this by adding the option AxesOrigin → {x,y}.

Maarten

4

Thank you so much, Maarten ! It does work !
Dear JIm, thank you, too! Fortunatley, it is not a bug !
Scabral