# Known issuesΒΆ

- Prism and tesseroid calculations are
**only valid outside**of the mass elements. If you calculate on top or inside of the prism/tesseroid, there is no guarantee that the result will be correct. - The gravity gradient components of tesseroids suffer from increased numerical error as the computation point gets closer to the tesseroid. It is not recommened to compute the effects at distances smaller than 1km above the tesseroid.