Scientific Reports 6: Article number: 2198010.1038/srep21980; Published online: February262016; Updated: May132016
This Article contains errors in the Results section under subheading ‘Measurement of anisotropy and focal point’,
“The literature value41 for the SAW propagation velocity was fitted with a parabolic function 
48 with the velocity v, the propagation angle ϕ towards the x direction and the anisotropy factor b. The parabolic fit leads to a theoretical value bfit = −0.228 (with dimensions of degree−2)”.
should read:
“The literature value41 for the SAW propagation velocity was fitted with a parabolic function 
48 with the velocity v, the propagation angle ϕ (in radian) towards the x direction and the anisotropy factor b. The parabolic fit leads to a theoretical value bfit = −0.228 (b is dimensionless)”.