the K issue is discussed in the newly added “Material and Method” section; so scattered mentioning of K has been deleted from the rest of text.
L119–123: if the K issue is relevant to understand the text then please add a proper explanation. If not, then keep it simple and avoid entering into the K issue (L122–123, L132, L135, L139, 183, and also remove this K = 6 from Figure 3.)