import matplotlib.pyplot as plt
import aplpy
import numpy as np

fig = aplpy.FITSFigure('test.fits')
fig.show_grayscale()

a=np.ndarray(shape=(2,2))
a[0][0]=200
a[0][1]=250
a[1][0]=300
a[1][1]=400

fig.show_lines(a)

plt.show()

Traceback (most recent call last):
File "draw.py", line 16, in <module>
fig.show_lines(a)
File "<string>", line 2, in show_lines
File "/home/swapnil/anaconda/lib/python2.7/site-packages/aplpy/decorators.py", line  25, in _auto_refresh
return f(*args, **kwargs)
File "/home/swapnil/anaconda/lib/python2.7/site-packages/aplpy/aplpy.py", line 1275, in show_lines
xp, yp = wcs_util.world2pix(self._wcs, line[0, :], line[1, :])
IndexError: too many indices