instr.	Å	element	ionization	eV	temp (K)
	1700	hydrogen	1		6,000
SOHO	304	helium	1		60,000
SOHO	284	iron	14	33.8	2,500,000
TRACE	211
SOHO	195	iron	11		1,000,000
SOHO	171	iron	8~9		1,500,000