It has been brought to our attention that in the paper by Kuan-Chen Chen et al. (ppap.201500183), published online on December 2, 2015, it was not unequivocally disclosed which PIC-MCC code the authors used for their calculations. In Section 3 Results and Discussion, the first sentence of the fifth paragraph reads in the original paper: To understand the experimental results, we calculated the axial distribution of electron energy distribution function (EEDF) using the one-dimensional PICMCC code.[9-10] The authors declared that the code they used was developed by PEGASUS Software Inc. They did not use the PIC-MCC code generated by Paola Diomede and Savino Longo as may have been indicated by the cited references 9 and 10. The afore mentioned sentence should read instead: To understand the experimental results, we calculated the axial distribution of electron energy distribution function (EEDF) using the one-dimensional PIC-MCC code developed by PEGASUS Software Inc. The PIC code developed by PEGASUS is not sufficient for understanding the experimental results. In the reference list, reference  and  are to be cancelled.
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