add GR plot of literature IMFs

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (bf3068e) 89.22% compared to head (e71a6b3) 90.23%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #10 +/- ## ========================================== + Coverage 89.22% 90.23% +1.01% ========================================== Files 3 3 Lines 297 297 ========================================== + Hits 265 268 +3 + Misses 32 29 -3 ```

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