The authors may include the following minor revisions suggested Reviewer-1. The paper can be accepted after incorporating these minor revisions


P5 L8 Please also add this information “All grid points with a percentage of missing number larger than 30% (white areas in Fig. 1b) have not been considered in the analysis” to figure 1 caption.

P5 23-30: Please adjust the format of Eq 1 to 3. Is “AS” a variable name or the product of A*S? Please use italic font for “A” in the text if it represents a variable name. I think journal may have its own guidance for the usage of mathematic terms. Please check that.

P6. Please give reference to the SVD method.

Table 1. Please use proper capitalization form. The authors may consider listing the reference of each dataset at the last row of the table, instead of listing all of them in the title.

P14 L3-5. This sentence is too long and hard to understand because it contains too many “and” which caused the problem of ambiguous meaning.
One can hardly tell what the correlation means for the structure like “correlation between A and B and C ”(it actually means corr of A and B, and corr of A and C). The usage of (a), (b) and “with” in title of figure 8 can alleviate this problem. So please reorganize this sentence, for example, by inserting Fig 8a, Fig 8b like the description for figure 9 of the next paragraph, or by breaking it into two separate sentences.