Color change the last column, with Formatting Rules

Hello community,

I have a question with formatting Rules.

You need to change Color of the cells only in the last column, the 12th

.

As seen in the screenshot I have done:

= Last ([Body] <[Avg_body]

But all the rows and columns of the table are marked.

Any idea how to fix it?

Thanks you!

Cheers,

Miquel.