JPMorgan Clashes With Citadel Securities: Here’s Why
JPMorgan, ever the aristocrat in this field, decided to cut the services it once freely offered Citadel Securities, after Citadel had the audacity to launch its own rival business. The nerve of it!

![A four-dimensional Markov Chain Monte Carlo analysis constrained the mass and orbital radius of quasi-periodic oscillations for stellar-mass black holes - XTE J1550-564, GRO J1655-40, GRS 1915+105, and M82 X-1 - revealing the inherent uncertainty in these parameters as defined by [latex]1\sigma[/latex] and [latex]2\sigma[/latex] confidence intervals, and highlighting the probabilistic nature of astrophysical modeling.](https://arxiv.org/html/2602.22264v1/2602.22264v1/M82_X-1_in.png)



