Sorry, I wasn't clear. I was really taking issue with your claim that WOC get paid less than white women. I was wondering where it is that white women and "WOC" in the same job working for the same employer get paid different wages.

The wage and earnings gap between the sexes is clear. Still, salary is not the same as a wage. And anecdotal evidence concerning starting salaries offered to job applicants in STEM or any field is not necessarily indicative of the actual salaries paid across all the employees in that field. To get a sense of the pay gap, you've got to look at much broader evidence concerning all the people actually hired - not just some (fake) prospective hires in an experiment - and over time.

Starting salaries in a field like STEM are discretionary and negotiable. One of the issues is that when applying for positions men ask for higher starting salaries than women do, and women do not put their foot down and drive a harder bargain.

But to get a picture of the sex wage/salary/earnings gap as well as the race one, STEM is a bad example, since it's a male dominated and also mainly white and Asian. To get a sense of the sex wage, salary and earning gap(s), you've got to look in fields where males and females work in more balanced numbers and in the exact same jobs. Same goes for when you're looking to compare what WOC and white women are paid/earn. Since so few women work in STEM, it's not a good source for info about wage/earnings disparities between/amongst women of different races. For that, you've got to look at areas like retail, health care, office work, hospitality, teaching - areas where women work in droves and there's a vast variety in terms of race, color and ethnicity.