The paper is improved since last revision. However, some context should be added. I consider this important but minor, as it does not require modification of the rationale or the development of the text, but rather the introduction and/or conclusion. It concerns the impact of the product presented. Since the title highlights the correction of a negative bias, it is important to note that this can improve the bias properties, but not fully correct them, and in particular, will not lead to profiles with as good traceability as GNSSRO higher in the atmosphere. |