I have the plot below as a picture and I need to remake the graphic in Excel with the proper equation.

First I printed on the paper the graphic above and I measured with ruler various values that I could see.

I inserted those values in Excel and I made a XY Scatter graphic.

Then I added a trend line and I found that a power trend line fits almost perfect to the measured points.

Excel generates automatic the equation, found as y=2.3728*xpower(-1.067).

I calculated back the y values from x values using the found equation for a double check and looks good.

As we can see on x axes we have log10 scale on original graph. I did the same on Excel.

Now, I need few things:

1) To have also a log scale on y axes as we can see in the initial graphic. I could not find how to set the chart in excel to have the same as in initial graphic and I need that. That is the most important thing.

2) On x and/or at least on y axes I would like to have the values corresponding to minor gridlines.

Excel-plot---reverse-plotting.xlsx