comments on “multipartite entanglement in four-qubit graph states”

the following comments are based on the article by m. jafarpour and l. assadi [eur. phys. j. d 70, 62 (2016), doi:10.1140/epjd/e2016-60555-5] which by means of scott measure (or generalized meyer- wallach measure) the entanglement quantity of four-qubit graph states has been calculated. we are to reveal that the scott measure (q_m) nominates limits for m which would prevent us from calculating q₃ in four-qubit system. incidentally in a counterexample we will confirm as it was recently concluded in the mentioned article, the q₂ quantity is not necessarily always greater than q₃ in all the graph states.