Correlation between the hard X-ray LC and the derivative of the soft X-ray LC demonstrating the Neupert effect (Equation (1)). (Top) XRISM/Xtend hard X-ray light curve in the 7.2–12.0 keV band (black) and time derivative of the XRISM/Xtend soft X-ray light curve in the 0.4–2.0 keV band (red). (Bottom) cross correlation between the hard X-ray LC (L_H) and the derivative of the soft X-ray LC (L_S) (black). Their lag is smaller than the 6 ks bin size. The insignificant cross correlation between the hard and soft X-ray LCs shown in Figure 2 is shown in gray.