"""Standard coordinate system-specific classes.

These modules provide a variety of coordinate-system-specific vector
classes. These classes are built on top of Numpy, and so objects created
from these classes should be usable wherever a Numpy ndarray object is
usable.

Modules
-------
cartesianvector2d.py
cartesianvector3d.py
cylindricalcoordsxaligned.py
cylindricalvector.py
latitudinalvector.py
polarvector.py
radecvector.py
sphericalvector.py
vectorij.py
vectorijk.py

Packages
--------
tests
"""
