Change the velocity of the source relative to the observer:

Balmer Series: Adds lines of Balmer series corresponding to n=3
through n=7.

Paschen Series: Adds lines of Paschen series corresponding to n=4
through n=8.

Lyman Series: Adds lines of Lyman series corresponding to n=2
through n=6.

Brackett Series: Adds lines of Brackett series corresponding to
n=5 through n=8.

Positive Velocity indicates that the emitter moves TOWARD observer.

Negative Velocity indicates that the emitter moves AWAY from observer.