Reading XShooter data with xtool¶

In [1]:

from xtool.data import XShooterData

In [2]:

xd = XShooterData('xtool_ds') # with the absolute or relative path given
xd

Out[2]:

<XShooterData XSHOO.2013-03-04T07:06:29.289.fits NIR>

You can access the individual orders given in the dataset by just indexing the dataset¶

In [3]:

xd[11]

Out[3]:

<Order 11 XSHOO.2013-03-04T07:06:29.289.fits NIR>

In [4]:

xd[5]

---------------------------------------------------------------------------
IndexError                                Traceback (most recent call last)
<ipython-input-4-dee1a2b27f4d> in <module>()
----> 1 xd[5]

/Users/wkerzend/projects/eso/xtool/xtool/data.pyc in __getitem__(self, item)
     52         if item not in self.order_table.index:
     53             raise IndexError('Dataset only contains orders {0} - {1}'.format(
---> 54                 self.order_table.index.min(), self.order_table.index.max()))
     55         else:
     56             return Order.from_xshooter_data(self, item)

IndexError: Dataset only contains orders 11 - 26

Each order contains the cutout of the order in masked arrays that cutout intraorder regions.¶

In [5]:

order = xd[11]

Each one of the order objects also contains a WCS that can transform between pixelspace and woorld coordinate system (angstrom, slit position)

In [6]:

order.wcs(51, 52)

Out[6]:

(2474.587158203125, 0.5863650441169739)