code: def ShowErrorBarCaps(ax):
      
      for ch in ax.get_children():
          if str(ch).startswith('Line2D'):
              ch.set_markeredgewidth(1)
              ch.set_markersize(8)
docs: Show error bar caps.
    
      Seaborn paper style hides error bar caps. Call this function on an axes
      object to make them visible again.