How to find Woocommerce Product Additional Information in the database?

I’m working on a WordPress website that has lots of Woocommerce products. I use the Product Additional Information section to list the different sizes of the products. I just noticed that I have made a mistake with many of the sizes and need to make the same change to a large number of products. I was going to write some code to do this task but firstly I need to find this data in the database, but I can’t find it. I’ve searched online but can’t find the answer. I’ve searched through wp_posts and wp_postmeta but it doesn’t seem to be there.

To be clear, I’m searching for a block of text/html in the WordPress database that includes the Product Additional Information that I added in the Edit Product page of each product. Where can I find this data?

Thanks!

 

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