Watson and Crick's use of DNA X-ray diffraction data collected by Rosalind Franklin and her student Raymond Gosling was unauthorized. Franklin's high-quality X-ray diffraction patterns of DNA were privileged unpublished information taken without permission from a scientist working on the same subject in another laboratory. Watson and Crick used some of Franklin's unpublished data—without her consent—in their construction of the double helix model of DNA. Franklin's results provided estimates of the water content of DNA crystals and these results were consistent with the two sugar-phosphate backbones being on the outside of the molecule. Franklin told Crick and Watson that the backbones had to be on the outside; before then, Linus Pauling and Watson and Crick had erroneous models with the chains inside and the bases pointing outwards. Her identification of the space group for DNA crystals revealed to Crick that the two DNA strands were antiparallel.