Three peak-pair ratios keep the denominator source fixed while the numerator changes. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
Row 1: ratio follows the two cited intensities
The denominator peak stays at intensity 1. When the numerator peak is 4, the source-bound ratio is 4 to 1.
4:1=4:1
Row 2: ratio follows the two cited intensities
The denominator peak stays at intensity 1. When the numerator peak is 16, the source-bound ratio is 16 to 1.
16:1=16:1
Row 3: ratio follows the two cited intensities
The denominator peak stays at intensity 1. When the numerator peak is 36, the source-bound ratio is 36 to 1.