Why is Rosalind Franklin significant in determining the shape of DNA?

o She purified and crystallized DNA
o She took x-ray diffraction image photos of the crystallized DNA. From her photo #51, it could be seen that the DNA had a constant width helical structure, with repeats at 3.4 angstroms and 34 angstroms.

She helped us understand the structure of DNA through her X-ray photographs

This is dealt with in Watson's book . Read it , rather than relying on the non-expertise of online non-experts .