Comment on "Quantification of Macroscopic Quantum Superpositions within   Phase Space"
  The phase space measure proposed by Lee and Jeong [PRL 106, 220401 (2011)] is shown to be closely related to a well-studied measure in the literature. For pure states, the newly proposed measure is equivalent to an old measure; for mixed states, some discussions are given. 
Jiangbin Gong
quant-ph