Any capitalisation wizards around?

[lady_karelia]

If in a sentence, a reference is made to the "subject line" of an e-mail, what would be the correct spelling? "Subject line", "subject line", or "Subject Line".

Example: There was no ticket number found in the Subject line, or the ticket number could not be parsed correctly.

Is "subject" and "line" capsed, not capsed, or is only "subject" capsed?

If you could help me solve this riddle, I'll be forever grateful because it is nagging me now.

Comments

[lady-karelia.livejournal.com]

Thanks for the idea to look there *snerk*, never thought of those two! I think the sun has finally addled my brain...