panchromatic dayside emission spectrum
It's like having a complete picture of WASP-121 b's atmosphere... (This analogy illustrates how combining multiple perspectives/photographs can create a comprehensive view, although it does not specifically state "panchromatic" – that term refers to the inclusion of all wavelengths in a visual representation.)
Technical definition
A spectroscopic observation technique involving the simultaneous collection and analysis of radiation from various parts of the electromagnetic spectrum, typically over a wide range of wavelengths (0.6-12 μm), to map the emission properties of a celestial object.