Diagram of α against the duration when the power-law flux is above 5% of the peak flux. The red data points refer to bursts from (hydrogen-deficient and, thus, rp-process deficient) UCXBs 4U 0513-40, 2S 0918-549, 4U 1728-34, 4U 1820-30, XB 1916-053, and 4U 2129+12. The blue data points refer to 4U 1636-536 and the orange points to GS 1826-24. This diagram shows the strongest trend in our data with two branches: the short (left) and long branch (right).