Slight simplification of astromax's answer:
plt.errorbar(x,y, yerr=err, capsize=20, elinewidth=3, markeredgewidth=10)
It seems that somehow markeredgewidth is defaulting to 0 sometimes.
Slight simplification of astromax's answer:
plt.errorbar(x,y, yerr=err, capsize=20, elinewidth=3, markeredgewidth=10)
It seems that somehow markeredgewidth is defaulting to 0 sometimes.