<s>[INST] Dr. Maria Hernandez, a renowned astrophysicist, has been studying the cosmic microwave background radiation (CMB) as part of her research. Specifically, she has been analyzing the minute fluctuations in the CMB's temperature across the sky. Dr. Hernandez's team has collected data from numerous astronomical surveys and missions, including the Cosmic Background Explorer (COBE), the Wilkinson Microwave Anisotropy Probe (WMAP), and the Planck satellite.
Dr. Hernandez is particularly interested in understanding how these tiny fluctuations relate to the distribution of matter and radiation in the universe during the Big Bang. Her goal is to gain insights into the fundamental laws of physics that governed the universe's evolution, especially during the very early stages of its history.
Suppose you are Dr. Hernandez, and you want to identify which data points correspond to the matter-dominated era of the universe, which began approximately 380,000 years after the Big Bang. How would you proceed to do this, and what key features of the CMB data would you look for?[/INST]