Index: axes.py
===================================================================
--- axes.py	(revision 5109)
+++ axes.py	(working copy)
@@ -3742,7 +3742,7 @@
 
 
     def errorbar(self, x, y, yerr=None, xerr=None,
-                 fmt='-', ecolor=None, capsize=3,
+                 fmt='-', ecolor=None, elinewidth=None, capsize=3,
                  barsabove=False, lolims=False, uplims=False,
                  xlolims=False, xuplims=False, **kwargs):
         """
@@ -3773,6 +3773,9 @@
             ecolor is a matplotlib color arg which gives the color the
             errorbar lines; if None, use the marker color.
 
+            elinewidth is the linewidth of the errorbar lines;
+            if None, use the linewidth.
+
             capsize is the size of the error bar caps in points
 
             barsabove, if True, will plot the errorbars above the plot symbols
@@ -3833,9 +3836,15 @@
 
         lines_kw = {'label':'_nolegend_'}
         if 'linewidth' in kwargs:
-            lines_kw['linewidth']=kwargs['linewidth']
+            if elinewidth is not None:
+                lines_kw['linewidth']=elinewidth
+            else:
+                lines_kw['linewidth']=kwargs['linewidth']
         if 'lw' in kwargs:
-            lines_kw['lw']=kwargs['lw']
+            if elinewidth is not None:
+                lines_kw['linewidth']=elinewidth
+            else:
+                lines_kw['lw']=kwargs['lw']
         if 'transform' in kwargs:
             lines_kw['transform'] = kwargs['transform']
 
@@ -3893,22 +3902,22 @@
                     # y are lists
                     leftlo, ylo = xywhere(left, y, xlolims)
 
-                    caplines.extend( self.plot(leftlo, ylo, ls='None', marker=mlines.CARETLEFT, **plot_kw) )
+                    caplines.extend( self.plot(leftlo, ylo, ls='None', marker=mlines.CARETLEFT, **lines_kw) )
                     xlolims = ~xlolims
                     leftlo, ylo = xywhere(left, y, xlolims)
-                    caplines.extend( self.plot(leftlo, ylo, 'k|', **plot_kw) )
+                    caplines.extend( self.plot(leftlo, ylo, 'k|', **lines_kw) )
                 else:
-                    caplines.extend( self.plot(left, y, 'k|', **plot_kw) )
+                    caplines.extend( self.plot(left, y, 'k|', **lines_kw) )
 
                 if xuplims.any():
 
                     rightup, yup = xywhere(right, y, xuplims)
-                    caplines.extend( self.plot(rightup,  yup, ls='None', marker=mlines.CARETRIGHT, **plot_kw) )
+                    caplines.extend( self.plot(rightup,  yup, ls='None', marker=mlines.CARETRIGHT, **lines_kw) )
                     xuplims = ~xuplims
                     rightup, yup = xywhere(right, y, xuplims)
-                    caplines.extend( self.plot(rightup,  yup, 'k|', **plot_kw) )
+                    caplines.extend( self.plot(rightup,  yup, 'k|', **lines_kw) )
                 else:
-                    caplines.extend( self.plot(right, y, 'k|', **plot_kw) )
+                    caplines.extend( self.plot(right, y, 'k|', **lines_kw) )
 
         if yerr is not None:
             if iterable(yerr) and len(yerr)==2 and iterable(yerr[0]) and iterable(yerr[1]):
@@ -3925,22 +3934,22 @@
 
                 if lolims.any():
                     xlo, lowerlo = xywhere(x, lower, lolims)
-                    caplines.extend( self.plot(xlo, lowerlo, ls='None', marker=mlines.CARETDOWN, **plot_kw) )
+                    caplines.extend( self.plot(xlo, lowerlo, ls='None', marker=mlines.CARETDOWN, **lines_kw) )
                     lolims = ~lolims
                     xlo, lowerlo = xywhere(x, lower, lolims)
-                    caplines.extend( self.plot(xlo, lowerlo, 'k_', **plot_kw) )
+                    caplines.extend( self.plot(xlo, lowerlo, 'k_', **lines_kw) )
                 else:
-                    caplines.extend( self.plot(x, lower, 'k_', **plot_kw) )
+                    caplines.extend( self.plot(x, lower, 'k_', **lines_kw) )
 
                 if uplims.any():
                     xup, upperup = xywhere(x, upper, uplims)
 
-                    caplines.extend( self.plot(xup, upperup, ls='None', marker=mlines.CARETUP, **plot_kw) )
+                    caplines.extend( self.plot(xup, upperup, ls='None', marker=mlines.CARETUP, **lines_kw) )
                     uplims = ~uplims
                     xup, upperup = xywhere(x, upper, uplims)
-                    caplines.extend( self.plot(xup, upperup, 'k_', **plot_kw) )
+                    caplines.extend( self.plot(xup, upperup, 'k_', **lines_kw) )
                 else:
-                    caplines.extend( self.plot(x, upper, 'k_', **plot_kw) )
+                    caplines.extend( self.plot(x, upper, 'k_', **lines_kw) )
 
         if not barsabove and fmt is not None:
             l0, = self.plot(x,y,fmt,**kwargs)
