Erratum to: Triple-frequency GPS precise point positioning with rapid ambiguity resolution

For this paper, the authors apologize to editors and readers for a mistake in Eq. 10. The precision of the ionosphere-free wide-lane observable L j xi should be σx ≈ 110.0σL rather than 100.7σL, because the two observables in Eq. 9, i.e. wide-lane and ambiguity-fixed extra-wide-lane carrier-phase observables, are not independent, but correlated through L2. So throughout the paper, all “100.7” should be corrected as “110.0”. In particular,