Fig. 7From: An effective approach for accurate estimation of VLBI–GNSS local-tie vectorsImage of the estimated rotation axes and observed target positions for the outside method. a Az axis and target positions. Red-colored vertical line stands for the estimated Az axis. Red dots represent the observed target positions. Red-colored circles represent the trajectory of the target positions used for the estimate of Az axis; b El axes and target positions. Colored horizontal lines stand for the estimated El axes. Colored dots and circles represent the observed target positions and trajectory of the target positions, respectivelyBack to article page