diff --git a/ausankey/ausankey.py b/ausankey/ausankey.py
index ee35fd4..e7d2175 100644
--- a/ausankey/ausankey.py
+++ b/ausankey/ausankey.py
@@ -314,13 +314,13 @@ def _sankey(
 
     # Determine sizes of individual strips
     barsize = [{}, {}]
-    for left_label in bar_lr[0]:
-        barsize[0][left_label] = {}
-        barsize[1][left_label] = {}
-        for right_label in bar_lr[1]:
-            ind = (labels_lr[0] == left_label) & (labels_lr[1] == right_label)
-            barsize[0][left_label][right_label] = weights_lr[0][ind].sum()
-            barsize[1][left_label][right_label] = weights_lr[1][ind].sum()
+    for lbl_l in bar_lr[0]:
+        barsize[0][lbl_l] = {}
+        barsize[1][lbl_l] = {}
+        for lbl_r in bar_lr[1]:
+            ind = (labels_lr[0] == lbl_l) & (labels_lr[1] == lbl_r)
+            barsize[0][lbl_l][lbl_r] = weights_lr[0][ind].sum()
+            barsize[1][lbl_l][lbl_r] = weights_lr[1][ind].sum()
 
     # Determine positions of left label patches and total widths
     y_bar_gap = bar_gap * plot_height
@@ -398,7 +398,7 @@ def _sankey(
         if ii == 0:
             xt = x_left - x_bar_width / 2
             if title_side in ("top", "both"):
-                yt = y_title_gap + barpos[0][left_label]["top"]
+                yt = y_title_gap + barpos[0][lbl_l]["top"]
                 va = "bottom"
                 ax.text(
                     xt,
@@ -422,7 +422,7 @@ def _sankey(
         # all other titles
         xt = x_right + x_bar_width / 2
         if title_side in ("top", "both"):
-            yt = y_title_gap + barpos[1][right_label]["top"]
+            yt = y_title_gap + barpos[1][lbl_r]["top"]
             ax.text(
                 xt,
                 yt,
@@ -442,29 +442,29 @@ def _sankey(
             )
 
     # Plot strips
-    for left_label in bar_lr[0]:
-        for right_label in bar_lr[1]:
-            lind = labels_lr[0] == left_label
-            rind = labels_lr[1] == right_label
+    for lbl_l in bar_lr[0]:
+        for lbl_r in bar_lr[1]:
+            lind = labels_lr[0] == lbl_l
+            rind = labels_lr[1] == lbl_r
 
             if not any(lind & rind):
                 continue
 
-            lbot = barpos[0][left_label]["bot"]
-            rbot = barpos[1][right_label]["bot"]
-            lbar = barsize[0][left_label][right_label]
-            rbar = barsize[1][left_label][right_label]
+            lbot = barpos[0][lbl_l]["bot"]
+            rbot = barpos[1][lbl_r]["bot"]
+            lbar = barsize[0][lbl_l][lbl_r]
+            rbar = barsize[1][lbl_l][lbl_r]
 
             ys_d = create_curve(lbot, rbot)
             ys_u = create_curve(lbot + lbar, rbot + rbar)
 
             # Update bottom edges at each label
             # so next strip starts at the right place
-            barpos[0][left_label]["bot"] += lbar
-            barpos[1][right_label]["bot"] += rbar
+            barpos[0][lbl_l]["bot"] += lbar
+            barpos[1][lbl_r]["bot"] += rbar
 
             xx = np.linspace(x_left, x_right, len(ys_d))
-            cc = combine_colours(color_dict[left_label], color_dict[right_label], len(ys_d))
+            cc = combine_colours(color_dict[lbl_l], color_dict[lbl_r], len(ys_d))
 
             for jj in range(len(ys_d) - 1):
                 ax.fill_between(