def venn3_circles(subsets, normalize_to=1.0, alpha=1.0, color='black', linestyle='solid', linewidth=2.0, ax=None, **kwargs):
'''
Plots only the three circles for the corresponding Venn diagram.
Useful for debugging or enhancing the basic venn diagram.
parameters ``subsets``, ``normalize_to`` and ``ax`` are the same as in venn3()
kwargs are passed as-is to matplotlib.patches.Circle.
returns a list of three Circle patches.
>>> plot = venn3_circles({'001': 10, '100': 20, '010': 21, '110': 13, '011': 14})
>>> plot = venn3_circles([set(['A','B','C']), set(['A','D','E','F']), set(['D','G','H'])])
'''
# Prepare parameters
if isinstance(subsets, dict):
subsets = [subsets.get(t, 0) for t in ['100', '010', '110', '001', '101', '011', '111']]
elif len(subsets) == 3:
subsets = compute_venn3_subsets(*subsets)
areas = compute_venn3_areas(subsets, normalize_to)
centers, radii = solve_venn3_circles(areas)
if ax is None:
ax = gca()
prepare_venn_axes(ax, centers, radii)
result = []
for (c, r) in zip(centers, radii):
circle = Circle(c, r, alpha=alpha, edgecolor=color, facecolor='none', linestyle=linestyle, linewidth=linewidth, **kwargs)
ax.add_patch(circle)
result.append(circle)
return result
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