© 2019 The Author(s) The authors regret an error in the paper that does not affect the efficacy of the method. In the paper, we state that the ratio of… Click to show full abstract
© 2019 The Author(s) The authors regret an error in the paper that does not affect the efficacy of the method. In the paper, we state that the ratio of phytolith forms calculated is the ratio of fixed (short) to sensitive (long) forms when in fact what is calculated is the ratio of sensitive to fixed forms. The authors would like to apologise for any confusion caused.
               
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