Fig. 6From: An approximate travel time calculation and a robust GNSS-acoustic positioning method using an MCMC techniqueScatter diagram of the shallow gradients and the deep gradients for the six sites. The shallow gradients were estimated using Method-3, and the deep gradients were estimated using Method-2. Red and blue symbols represent EW and NS components. The solid line represents the linear regression line. The regression equation and the correlation coefficient are shownBack to article page