I thank the authors for providing an advanced copy of the preceding paper in RCMS on which the CRDS measurements are based. Having now seen this paper, I agree that the two papers can be separated as they address different aspects of the measurement problem. However, taking referee #2's comments into account, I suggest that a succinct summary of the RCMS paper be provided in the methods section, so that the reader can learn all that is needed to interpret the present paper without need to read the RCMS paer. This need only be a short paragraph. It should clearly set out the precision and accuracy of the CRDS measurement which underlies the present paper. In this way the extensive discussion of precision and accuracy of the syringe sampling method can be clearly distinguished from the underlying analyser precision and accuracy.

I think the video is useful and support its "publication", but I do not know if Copernicus has the facility to publish it with a link for viewing or downloading. It should be available on the web for 5-10 years. Perhaps a simple YouTube link would suffice.