Analysis of IRIS Si IV 1402.77 Å line for the jets with two directions. a1–a3: spectral analysis of the jets toward the solar surface. The black vertical line in (a1) marks the location of spectrograph slit at 01:43:41 UT, and the arrows denote the directions of downward jet flows cross the slit. Panel a2: Si IV 1402.77 Å line spectra along the slit. Panel a3: exhibits the Si IV 1402.77 Å line profiles (plus signs) and their single-Gaussian fitting profiles (solid curves) at positions indicated by the blue and red plus signs (dotted lines) shown in (a2). b1–b3: Similar to (a1)–(a3), but for the jets ejecting upward.