 In a gas @-@ filled tube , xenon emits a blue or lavenderish glow when the gas is excited by electrical discharge . Xenon emits a band of emission lines that span the visual spectrum , but the most intense lines occur in the region of blue light , which produces the coloration . 
 In a gas @-@ filled tube , xenon <a href='uninflect' title='1'><mark>emits</mark></a> a blue or lavenderish glow when the gas is excited by electrical discharge . Xenon <a href='uninflect' title='2'><mark>emits</mark></a> a band of emission lines <a href='null_relcl' title='3'><mark>that</mark></a>span the visual spectrum , but the most intense lines occur in the region of blue light , which <a href='uninflect' title='4'><mark>produces</mark></a> the coloration . 
In a gas @-@ filled tube , xenon emit a blue or lavenderish glow when da gas is excited by electrical discharge . Xenon emit a band of emission lines span the visual spectrum , but the most intense lines occur in tdaregion of blue light , which produce the coloration .