ALMA ¹³CO (2-1) (left panel) and SiO (5-4) (right panel) images of G26.50+0.28. The blue contours in each panel are integrated from 70 to 103 km s⁻¹ and the red ones are integrated from 105 to 138 km s⁻¹. The contour levels of ¹³CO (2-1) are set to [4, 8, 12, 16, 20, 24, 28, 40, 52, 64, 76, 88, 100] × 28.5 mly beam⁻¹ km s⁻¹. The SiO (5-4) levels are set to [4, 8, 12, 16, 20, 24, 28, 32, 40, 48] × 28.7 mly beam⁻¹ km s⁻¹. The blue and red arrows in the two panels indicate the direction of the jet. The dashed blue and red arrows denote the axis of the biconical outflow determined by Qiu et al. (2012). The solid gray lines denote the shells of the wide-angle outflow with opening angle of about 140°. A filled ellipse in the lower left of each panel shows the beams. The filled squares denote the peak positions of MM1 and MM2. The black curved lines denote the loci of the precessing jet.