p1 fails with ValueError

[iancrossfield]

TLDR: Matplotlib has changed the valid options for imshow. Commenting out the 'origin' keyword results in a successful execution and avoids the error trace below.

$ python poet.py p1

Traceback (most recent call last):
File "/home/ianc/proj/spitzer/hd73344/poet/run/poet.py", line 44, in
e = p1.Event(arg)
File "/home/ianc/python/POET/code/lib/poet_1event.py", line 44, in init
self.check()
File "/home/ianc/python/POET/code/lib/poet_1event.py", line 410, in check
plt.imshow(image, interpolation='nearest', origin='ll', cmap=plt.cm.gray)
File "/home/ianc/miniconda3/lib/python3.9/site-packages/matplotlib/_api/deprecation.py", line 456, in wrapper
return func(*args, **kwargs)
File "/home/ianc/miniconda3/lib/python3.9/site-packages/matplotlib/pyplot.py", line 2640, in imshow
__ret = gca().imshow(
File "/home/ianc/miniconda3/lib/python3.9/site-packages/matplotlib/_api/deprecation.py", line 456, in wrapper
return func(*args, **kwargs)
File "/home/ianc/miniconda3/lib/python3.9/site-packages/matplotlib/init.py", line 1412, in inner
return func(ax, *map(sanitize_sequence, args), **kwargs)
File "/home/ianc/miniconda3/lib/python3.9/site-packages/matplotlib/axes/_axes.py", line 5482, in imshow
im = mimage.AxesImage(self, cmap, norm, interpolation,
File "/home/ianc/miniconda3/lib/python3.9/site-packages/matplotlib/image.py", line 929, in init
super().init(
File "/home/ianc/miniconda3/lib/python3.9/site-packages/matplotlib/image.py", line 249, in init
_api.check_in_list(["upper", "lower"], origin=origin)
File "/home/ianc/miniconda3/lib/python3.9/site-packages/matplotlib/_api/init.py", line 129, in check_in_list
raise ValueError(msg)
ValueError: 'll' is not a valid value for origin; supported values are 'upper', 'lower'