MIRI MRS 1 SHORT spectra for Hα observed at z = 7.1513. Top left: Hα spectra shown in velocity space for two spatially separated galaxies, E and W (red line and green line, respectively), identified in the Hα line map. The black line shows the integrated MRS spectrum of B14-65666 extracted using the galaxies E+W aperture. Top right: E+W galaxies’ integrated Hα spectrum. A vertical dashed line shows the wavelength of the weaker undetected lines [N II] 6550 Å and [N II] 6585 Å that are well separated in wavelength from Hα 6563 AA. Bottom left: Galaxy E’s integrated Hα spectrum. Bottom right: Galaxy W’s integrated Hα spectrum. The red dashed line shows the single Gaussian fits, with the residuals shown in the bottom panels. 1σ noise level is shown in yellow; it was calculated from the continuum adjacent to the emission line.