This is similar to the question here, but my question is different because I'm not asking about ever using "you" in my writing.
I quite like using the turn of phrase "Note that...". For example, I'm discussing some feature of data that reflects a physical property. But then I want so say that my data looks a little different because of such-and-such reasons. So, I would like to write something along the lines of: "Note that all experimental data in this manuscript shows just half of the typical shape because we performed only half of the typical sweep."
When I write "Note...", I'm actually speaking to the reader directly. It's kind of like saying, "Hey you! Pay attention here!" Everywhere else in the manuscript the focus is on the experiment and not on the reader. So, would this be frowned upon?