摘要：The authors would like to point out two errors in the article
as it was originally published.
Due to a typographical error, Eq. (17) erroneously expresses
the shear of the elliptical power law profile lens in the elliptic
coordinates R and ϕ instead of the physical polar coordinates r
and θ. The correct expression is
γ(r,θ) = −e i2θ κ(r) + (1 − t)e iθ
α(r,θ)
r
, (17)
i.e. the same formula with the substitutions R → r and ϕ → θ.
This result correctly recovers the singular isothermal ellipsoid
result γ =
