# Test record

**Published by:** [Sergey Quantum](https://paragraph.com/@sergey-quantum/)
**Published on:** 2023-07-09
**URL:** https://paragraph.com/@sergey-quantum/test-record

## Content

Two reasons why the EHT black hole image on the right is better:The PCA method captures correlations and fills in the gaps in highly sparse data betterA Butterworth filter was used before PCA, which approximates the data more accurately < https://doi.org/10.3847/2041-8213/acc32d>

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