DEIMOS user script abba

Name

abba -- acquire spectra in an ABBA sequence

Purpose

Acquire one or more sequences of four spectra in which the
first and last images are offset to one side of the starting
point, and the second and third lie on the other side.

Usage

abba [size [repeats]]

Arguments

size = dither size to each side of starting location
[arcsec; default=1.0 arcsec]
repeats = number of times to repeat ABBA pattern [default=1]

Output

To stdout

Retrictions

Slits must be untilted.

Side effects

Marks base before starting exposure sequence

Exit values

0 = normal completion
1 = wrong number of arguments

Example

1) Acquire a single ABBA sequence with 1.0-arcsec nods
abba

1) Acquire five single ABBA sequences with 1.5-arcsec nods
abba 1.5 5