Observation of He-like satellite lines of the H-like potassium K XIX emission by Weller, ME, Beiersdorfer, P, Lockard, TE, Brown, GV, McKelvey, A, Nilsen, J, Shepherd, R, Soukhanovskii, VA, Hill, MP, Hobbs, LMR, Burridge, D, Hoarty, DJ, Morton, J, Wilson, L, Rose, SJ, Hatfield, P