Line list 12 Standard Synoptic Line Selection (NIS)- 15 lines He II 303.78 (2) NIS2 772 Mg X 624.94 (1) NIS2 920 O IV 554.52 (1) NIS2 320 Si IX 341.95 (1) NIS1 457 Si IX 349.87 (1) NIS1 571 Mg IX 368.06 (1) NIS1 831 Si XI 303.33 (2) NIS2 764 He I 584.33 (1) NIS2 574 Si XI 604 (1) NIS2 742 Si XI 580.90 (1) NIS2 544 Fe XVI 335.40 (1) NIS1 364 Al XI 550.03 (1) NIS2 282 Si XII 520.67 (1) NIS2 31 Ar XVI 353.92 (1) NIS1 629 Ca XVIII 344.77 (1) NIS1 498