O3-review/known-events.md

 # Known event comparisons
 
-All event comparisons for known events are stored in [bilby_pe_event_samples repo](https://git.ligo.org/gregory.ashton/bilby_pe_event_samples)
+All event comparisons for known events are stored in [bilby_pe_event_samples repo](https://git.ligo.org/gregory.ashton/bilby_pe_event_samples).
 
+These events are analysed using a prior that is flat in chirp mass and mass ratio. In order to compare against the LALInference results, which use a prior that is flat in component masses, we utilise the Jacobian given in eq. 21 of [Vietch et al (2015)](https://arxiv.org/pdf/1409.7215.pdf):
+```
+weights = np.square(bilby_posterior['mass_1']) / bilby_posterior['chirp_mass']
+```
 
 
 | event | comments | links | review status |
 | ------ | ------ | ------ | ------ |
-| GW150914 | | [git-repo](https://git.ligo.org/gregory.ashton/bilby_pe_event_samples/blob/master/GW150914/README.md) [run repository](https://ldas-jobs.ligo.caltech.edu/~isobel.romero-shaw/known_events/GW150914/), [LI comparison](https://ldas-jobs.ligo.caltech.edu/~isobel.romero-shaw/known_events/GW150914/results_correct_priors_v0-5-2/result/lalinf_comparison_weighted/) | ongoing|
+| GW150914 | | [git-repo](https://git.ligo.org/gregory.ashton/bilby_pe_event_samples/blob/master/GW150914/README.md),[run repository](https://ldas-jobs.ligo.caltech.edu/~isobel.romero-shaw/known_events/GW150914/), [LI comparison](https://ldas-jobs.ligo.caltech.edu/~isobel.romero-shaw/known_events/GW150914/results_correct_priors_v0-5-2/result/lalinf_comparison_weighted/) | ongoing|
 | GW151012 | | | ongoing|
 | GW151226 | | [run repository](https://ldas-jobs.ligo.caltech.edu/~isobel.romero-shaw/known_events/GW151226/), [LI comparison](https://ldas-jobs.ligo.caltech.edu/~isobel.romero-shaw/known_events/GW151226/results_constraints_calibration_v0-5-2/result/lalinf_comparison_weighted/)|ongoing|
 | GW170104 | | | ongoing|