You get used to the exact amount of space between lines. You write a word and then you write an alternate word over it. You want enough room so you can read it, so the lines can't be too close.
Stephen SondheimLet the moment go. . . . Don't forget it for a moment, though. Just remembering you've had an "and" when you're back to "or" makes the "or" mean more than it did before. . . . Now I understand! And it's time to leave the woods.
Stephen Sondheim