Top: two maps of the active region jet2 at 11:45 UT at two different temperatures (log T = 5.8 and 6.3). The blue square in panel a shows the location we used for the emission analysis at the jet spire. The black arrow in panel a indicates a weak EM region that we call the cool jet, and the white arrow in panel b shows the hot jet. Bottom: the red line shows the temperature at the location of the blue box in panel a before the first jet ejection on April 4, 2017, and the black line shows the temperature of the solar active region jet at 11:45 UT.