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I am unable to denote the origin of my plot.

plot1 = Plot[ccads, {\[Sigma], 0, 0.5}, PlotRange -> {-1.5, 3}, 
Ticks -> {{0, 1, 2}, {0, -1, 1}}, 
Epilog -> {Black, PointSize@Large, Point[{0.07957747154594766`, 0}],
Point[{0.23873241463784303`, 0}]} ,  
AxesLabel -> {HoldForm[4 \[Pi] Subscript[G, 4 ] \[Sigma]], 
HoldForm[Subscript[\[CapitalLambda], 3]]}, PlotLabel -> None, 
LabelStyle -> {12, GrayLevel[0]}]

enter image description here

It does not appear automatically and unfortunately nor with my attempt of brute force using

Ticks -> {{0, 1, 2}, {0, -1, 1}}

Actually, I don't want anything but the "0" denoting the origin. How can I accomplish this?

Unfortunately, it is not an option to place a text "0" at the origin since it will interfere with the axes in a way that looks unprofessional. I am very surprised it is so little or bad information on how to accomplish this simple task. Any help is very appreciated.

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    $\begingroup$ There is a conflict in your code. On the one hand, you plot from 0 to 0.5 along the axis sigma. On the other hand, you expect to have ticks {0, 1, 2}. You need to plot until sigma=2.1 or 2.2 to see the tick 2. Further, plotting with the axis does not allow to put the tick in the origin. If you need that try plotting with the frame. That is, include the option Frame->True and use FrameTicks->{....} instead of Ticks. If you would post your function ccads the help could have been more to the point. $\endgroup$ – Alexei Boulbitch Jun 10 at 10:57
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You should explicitly specify both horizontal plot range and AxesOrigin:

Plot[5 x^2 - .5, {x, -1, 2}, PlotRange -> {{-1, 2}, {-1.5, 3}}, 
 AxesOrigin -> {-1, 0}, 
 Epilog -> {Black, PointSize@Large, Point[{0.08, 0}], Point[{0.2`, 0}]}]

plot

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