# Why do the displayed ticks from a Plot of a function not match the ones extracted through ChartingFindTicks in this case?

This is my first time to post here, so please bear with me as I learn how to post and format properly ...

I've been using ChartingFindTicks to get a list of the tick marks, both major and minor, from various plots. My intention is to develop modules for further enhancing my plots, and I require the list of generated tick marks from both axes. In some particular cases, however, I've noticed that the plot generated by Mathematica does not match what I get using ChartingFindTicks.

Here is an example plot of the sine function. (Note that I am not explicitly setting PlotRange in this case, although even when I do, I still come up with the same discrepancy that I am describing in this post.)

PLT=Plot[Sin[x], {x, 0, 2 \[Pi]}]

Regarding the horizontal axis, we see that the major ticks are {0,1,2,3,4,5,6}, and the minor tick marks are spaced at intervals of 0.2.

Now I extract the list of tick marks as follows:

ChartingFindTicks[{0, 1}, {0, 1}] @@ PlotRange[PLT][[1]]

{{0.,0},{2.,2},{4.,4},{6.,6},{8.,8},{0.,,{0.005,0.},{AbsoluteThickness[0.1]}},{0.5,,{0.005,0.},{AbsoluteThickness[0.1]}},{1.,,{0.005,0.},{AbsoluteThickness[0.1]}},{1.5,,{0.005,0.},{AbsoluteThickness[0.1]}},{2.,,{0.005,0.},{AbsoluteThickness[0.1]}},{2.,,{0.005,0.},{AbsoluteThickness[0.1]}},{2.5,,{0.005,0.},{AbsoluteThickness[0.1]}},{3.,,{0.005,0.},{AbsoluteThickness[0.1]}},{3.5,,{0.005,0.},{AbsoluteThickness[0.1]}},{4.,,{0.005,0.},{AbsoluteThickness[0.1]}},{4.,,{0.005,0.},{AbsoluteThickness[0.1]}},{4.5,,{0.005,0.},{AbsoluteThickness[0.1]}},{5.,,{0.005,0.},{AbsoluteThickness[0.1]}},{5.5,,{0.005,0.},{AbsoluteThickness[0.1]}},{6.,,{0.005,0.},{AbsoluteThickness[0.1]}},{6.,,{0.005,0.},{AbsoluteThickness[0.1]}},{6.5,,{0.005,0.},{AbsoluteThickness[0.1]}},{7.,,{0.005,0.},{AbsoluteThickness[0.1]}},{7.5,,{0.005,0.},{AbsoluteThickness[0.1]}},{8.,,{0.005,0.},{AbsoluteThickness[0.1]}}}

Note that the first items of the list should show the labeled major ticks of the horizontal axes of the plot, however this only lists {0,2,4,6,8}. Further, the remaining minor ticks are spaced at intervals of 0.5, not 0.2 as displayed.

Why does this output from ChartingFindTicks not match the displayed plot?

In contrast, note that the displayed and extracted ticks of the vertical axis are in agreement. The displayed major ticks are {-1,-0.5,0,0.5,1} with minor tick intervals of 0.1. The extracted ticks are the same:

ChartingFindTicks[{0, 1}, {0, 1}] @@ PlotRange[PLT][[2]]

{{-1.,-1.0},{-0.5,-0.5},{0.,0},{0.5,0.5},{1.,1.0},{-1.,,{0.005,0.},{AbsoluteThickness[0.1]}},{-0.9,,{0.005,0.},{AbsoluteThickness[0.1]}},{-0.8,,{0.005,0.},{AbsoluteThickness[0.1]}},{-0.7,,{0.005,0.},{AbsoluteThickness[0.1]}},{-0.6,,{0.005,0.},{AbsoluteThickness[0.1]}},{-0.5,,{0.005,0.},{AbsoluteThickness[0.1]}},{-0.5,,{0.005,0.},{AbsoluteThickness[0.1]}},{-0.4,,{0.005,0.},{AbsoluteThickness[0.1]}},{-0.3,,{0.005,0.},{AbsoluteThickness[0.1]}},{-0.2,,{0.005,0.},{AbsoluteThickness[0.1]}},{-0.1,,{0.005,0.},{AbsoluteThickness[0.1]}},{0.,,{0.005,0.},{AbsoluteThickness[0.1]}},{0.,,{0.005,0.},{AbsoluteThickness[0.1]}},{0.1,,{0.005,0.},{AbsoluteThickness[0.1]}},{0.2,,{0.005,0.},{AbsoluteThickness[0.1]}},{0.3,,{0.005,0.},{AbsoluteThickness[0.1]}},{0.4,,{0.005,0.},{AbsoluteThickness[0.1]}},{0.5,,{0.005,0.},{AbsoluteThickness[0.1]}},{0.5,,{0.005,0.},{AbsoluteThickness[0.1]}},{0.6,,{0.005,0.},{AbsoluteThickness[0.1]}},{0.7,,{0.005,0.},{AbsoluteThickness[0.1]}},{0.8,,{0.005,0.},{AbsoluteThickness[0.1]}},{0.9,,{0.005,0.},{AbsoluteThickness[0.1]}},{1.,,{0.005,0.},{AbsoluteThickness[0.1]}}}

I appreciate your help in understanding what is going on with the horizontal axis. How can I programmatically extract the actual ticks being displayed?