Although EQN tries to get most things at the right place on the paper, it isn't perfect, and occasionally you will need to tune the output to make it just right. Small extra horizontal spaces can be obtained with tilde and circumflex. You can also say back n and fwd n to move small amounts horizontally. n is how far to move in 1/100's of an em (an em is about the width of the letter `m'.) Thus back 50 moves back about half the width of an m. Similarly you can move things up or down with up n and down n. As with sub or sup, the local motions affect the next thing in the input, and this can be something arbitrarily complicated if it is enclosed in braces.