A ratio is accepted only when both peak intensities are cited. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.

highlighted = computed this step

The ratio cites two checked peaks

The high peak has intensity 16 and the low peak has intensity 4.

Ihigh=16Ilow=4I_{\text{high}}=16\quad I_{\text{low}}=4
X-ray intensity ratioTwo checked structure-factor intensities make one exact ratio.high=16low=4ratio=4/1accepted=1

The exact ratio is four to one

The source-bound ratio is 4 to 1.

16:4=4:116:4=4:1
X-ray intensity ratioTwo checked structure-factor intensities make one exact ratio.high=16low=4ratio=4/1accepted=1