Thank you for your question. The retrieval method for layered water vapor is analogous to that used for spaceborne infrared hyperspectral data. Initially, we invert the atmospheric profile and subsequently integrate across the three primary atmospheric layers (mentioned in our manuscript). This algorithm utilizes all 10 infrared channels of the Himawari-8 satellite, primarily employing the GFS numerical forecast profile as the initial value. The new atmospheric profile is then derived through variational iterative calculations.