I think the following PRs are mergeable but do not have enough reviewers. Most of these are pretty small and self-contained and will be quick to review.

Could we please get some more eyes on these pull requests:

Adding a `plot_2d` helper function for visualizing 2D datasets (although John mentioned he still needs to add docs):

Make it possible for users to force ramses data to be loaded as a cosmological dataset:

Fix documentation for the `unit_base` keyword argument for Gadget data:

Make FitsImageData accept DerivedField instances as fields (e.g. ds.fields.gas.density)

Fix issues with parsing WarpX headers:

Update documentation on finding field values at a single point or a set of points: