Added second proof response.

1 files changed, 25 insertions, 0 deletions

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+> 1. Please provide zip code for affiliation on line 4.
+
+Our zip code is 75005.
+
+> 2.  We checked with the Physical Review Research editor, who will allow your
+> requested change regarding en dash. Please check.
+
+The changes look good, thank you!
+
+> 3. We have set Ref. [18] as per style.
+
+Ok.
+
+I don't know if this is standard, but the typesetting of the "ln" operators
+seems funny - I am used to seeing thin spaces on each side of the operators
+(like they appear around "Re", "exp", etc). It looks particularly strange in the
+uses of "ln \mathcal N". Can the "ln" operators be typeset like the other math
+operators? Here is a list of where they appear:
+
+  - Lines 10 (twice), 117, and 119.
+
+  - Equations (9), twice in (13), twice in (14), twice in (16), twice in (17),
+    and twice in (18).
+
+  - Twice in the caption of Fig 2.