Tian, Feng
Ida, Shigeru
Article History
Received: 1 September 2014
Accepted: 20 January 2015
First Online: 16 February 2015
Change Date: 19 February 2015
Change Type: Erratum
Change Details: In the version of this Letter originally published, in Fig. 1, the <i>x</i> axes should have been labelled '<i>a</i> (<scp>au</scp>)' and the <i>y</i> axes should have indicated water mass fraction. These errors have been corrected in all versions of the Letter.
Competing interests
: The authors declare no competing financial interests.