Ah thanks so the explanation, the second part is still a bit confusing for me. When the author writes "A normalization constant squishes the input distribution,

Ah thanks so the explanation, the second part is still a bit confusing for me. When the author writes "A normalization constant squishes the input distribution, for example, I5, into the target distribution, for example, I3." It makes me think normalisation in the range (0-2) which I3 is in. Do I have that right?