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- OGLE Queries (`astroquery.ogle`)

# OGLE Queries (`astroquery.ogle`)

## Getting started

The Optical Gravitational Lensing Experiment III (OGLE-III) stores information on the interstellar extinction towards the Galactic Bulge. The `astroquery.ogle` module queries the online extinction calculator and returns an `Table` instance with the same data. To run a single query using an `astropy.coordinates` instance use:

    >>> from astropy import coordinates
    >>> from astropy import units as u
    >>> from astroquery.ogle import Ogle
    >>> co = coordinates.SkyCoord(0*u.deg, 3*u.deg, frame='galactic')
    >>> t = Ogle.query_region(coord=co)

Arguments can be passed to choose the interpolation algorithm, quality factor, and coordinate system. Multiple coordinates may be queried simultaneously by passing a list-like object of string/float values or a list-like object of `astropy.coordinates` instances. All of coordinates will be internally converted to FK5.

    >>> # list of coordinate instances
    >>> co_list = [co, co, co]
    >>> t1 = Ogle.query_region(coord=co_list)
    >>> # (2 x N) list of values
    >>> co_list_values = [[0, 0, 0], [3, 3, 3]]
    >>> t2 = Ogle.query_region(coord=co_list_values, coord_sys='LB')

Note that non-Astropy coordinates may not be supported in a future version.

## Troubleshooting

If you are repeatedly getting failed queries, or bad/out-of-date results, try clearing your cache:

    >>> from astroquery.ogle import Ogle
    >>> Ogle.clear_cache()

If this function is unavailable, upgrade your version of astroquery. The `clear_cache` function was introduced in version 0.4.7.dev8479.

## Reference/API

### astroquery.ogle Package

#### OGLE Query Tool

Author:

  Brian Svoboda (svobodb@email.arizona.edu)

This package is for querying interstellar extinction toward the Galactic bulge from OGLE-III data hosted at.

Note:

  If you use the data from OGLE please refer to the publication by Nataf et al. (2012).

#### Classes

`OgleClass`() |
`Conf`() | Configuration parameters for `astroquery.ogle`.