MRS 1LONG spectrum of MACS1149-JD1 centered on the Hα emission line. The left panel shows the total integrated Hα spectrum. The black line represents the integrated MRS spectrum of MACS1149-JD1 extracted using the total aperture (see Fig. 1). The red dashed line and area are the best one-component Gaussian fit. The gray area indicates the ±1σ calculated as the standard deviation from nine different background spectra. The green dashed line shows the location of the [NII]6550, 6565 Å emission lines. The right panel shows the Hα spectra in velocity space for the two spatially separated clumps identified in the Hα line map. The black line represents the integrated MRS spectrum of MACS1149-JD1 extracted using the total aperture. The red line and area indicate the integrated MRS spectrum of clump S. The blue line and area show the integrated MRS spectrum of clump N.