For as long as one has no further point of reference, apart from the position of the maximum, the wavelength thus remains uncertain by an integral factor.
“In the 60's there was a look. In the 70's there was a look, and in the 80's. Now, it's a free-for-all.”
“What's the problem with 'never?' It keeps you from trying. It ensures that you will fail. End of story.”