diff --git a/analysis/matlab/variations/naive_boxa_d6_13/learning_curve.png b/analysis/matlab/variations/naive_boxa_d6_13/learning_curve.png
index 480a1ee..2be1a17 100644
Binary files a/analysis/matlab/variations/naive_boxa_d6_13/learning_curve.png and b/analysis/matlab/variations/naive_boxa_d6_13/learning_curve.png differ
diff --git a/analysis/matlab/variations/naive_boxa_d6_13/learning_curve_rate.png b/analysis/matlab/variations/naive_boxa_d6_13/learning_curve_rate.png
index 7258b0b..47f3fd5 100644
Binary files a/analysis/matlab/variations/naive_boxa_d6_13/learning_curve_rate.png and b/analysis/matlab/variations/naive_boxa_d6_13/learning_curve_rate.png differ
diff --git a/analysis/matlab/variations/naive_boxa_d6_13/plotcurve.m b/analysis/matlab/variations/naive_boxa_d6_13/plotcurve.m
index 193a44b..8fb7f44 100644
--- a/analysis/matlab/variations/naive_boxa_d6_13/plotcurve.m
+++ b/analysis/matlab/variations/naive_boxa_d6_13/plotcurve.m
@@ -38,8 +38,9 @@ legend([e1 e2], {sprintf('anodal, N = %d', na), sprintf('control, N = %d', nc)},
     'Location', 'northwest', 'Box', 'off');
 xlabel('training day'); ylabel(ylab);
 title(vname, 'Interpreter', 'none');
-set(gca, 'XTick', xd, 'FontName', 'Arial', 'FontSize', 13, 'LineWidth', 1.5, 'Box', 'off');
-xtickangle(90);                  % vertical x-axis tick labels
+set(gca, 'XTick', xd, 'XTickLabelRotation', 90, ...   % vertical x-axis tick labels
+    'FontName', 'Arial', 'FontSize', 13, 'LineWidth', 1.5, 'Box', 'off');
+drawnow;                         % force layout so the rotation is applied headless
 exportgraphics(fig, outFile, 'Resolution', 150);
 close(fig);
 fprintf('%s: wrote %s (anodal N=%d, control N=%d)\n', vname, outFile, na, nc);
diff --git a/analysis/matlab/variations/prev_f_full/learning_curve.png b/analysis/matlab/variations/prev_f_full/learning_curve.png
index 7971adb..b4bed5f 100644
Binary files a/analysis/matlab/variations/prev_f_full/learning_curve.png and b/analysis/matlab/variations/prev_f_full/learning_curve.png differ
diff --git a/analysis/matlab/variations/prev_f_full/learning_curve_rate.png b/analysis/matlab/variations/prev_f_full/learning_curve_rate.png
index 8a6ddf1..a92839b 100644
Binary files a/analysis/matlab/variations/prev_f_full/learning_curve_rate.png and b/analysis/matlab/variations/prev_f_full/learning_curve_rate.png differ
diff --git a/analysis/matlab/variations/prev_f_full/plotcurve.m b/analysis/matlab/variations/prev_f_full/plotcurve.m
index 193a44b..8fb7f44 100644
--- a/analysis/matlab/variations/prev_f_full/plotcurve.m
+++ b/analysis/matlab/variations/prev_f_full/plotcurve.m
@@ -38,8 +38,9 @@ legend([e1 e2], {sprintf('anodal, N = %d', na), sprintf('control, N = %d', nc)},
     'Location', 'northwest', 'Box', 'off');
 xlabel('training day'); ylabel(ylab);
 title(vname, 'Interpreter', 'none');
-set(gca, 'XTick', xd, 'FontName', 'Arial', 'FontSize', 13, 'LineWidth', 1.5, 'Box', 'off');
-xtickangle(90);                  % vertical x-axis tick labels
+set(gca, 'XTick', xd, 'XTickLabelRotation', 90, ...   % vertical x-axis tick labels
+    'FontName', 'Arial', 'FontSize', 13, 'LineWidth', 1.5, 'Box', 'off');
+drawnow;                         % force layout so the rotation is applied headless
 exportgraphics(fig, outFile, 'Resolution', 150);
 close(fig);
 fprintf('%s: wrote %s (anodal N=%d, control N=%d)\n', vname, outFile, na, nc);
diff --git a/analysis/matlab/variations/right_only_d0_10/learning_curve.png b/analysis/matlab/variations/right_only_d0_10/learning_curve.png
index 7354cbe..7664c2a 100644
Binary files a/analysis/matlab/variations/right_only_d0_10/learning_curve.png and b/analysis/matlab/variations/right_only_d0_10/learning_curve.png differ
diff --git a/analysis/matlab/variations/right_only_d0_10/learning_curve_rate.png b/analysis/matlab/variations/right_only_d0_10/learning_curve_rate.png
index 9c30c9e..7070a62 100644
Binary files a/analysis/matlab/variations/right_only_d0_10/learning_curve_rate.png and b/analysis/matlab/variations/right_only_d0_10/learning_curve_rate.png differ
diff --git a/analysis/matlab/variations/right_only_d0_10/plotcurve.m b/analysis/matlab/variations/right_only_d0_10/plotcurve.m
index 193a44b..8fb7f44 100644
--- a/analysis/matlab/variations/right_only_d0_10/plotcurve.m
+++ b/analysis/matlab/variations/right_only_d0_10/plotcurve.m
@@ -38,8 +38,9 @@ legend([e1 e2], {sprintf('anodal, N = %d', na), sprintf('control, N = %d', nc)},
     'Location', 'northwest', 'Box', 'off');
 xlabel('training day'); ylabel(ylab);
 title(vname, 'Interpreter', 'none');
-set(gca, 'XTick', xd, 'FontName', 'Arial', 'FontSize', 13, 'LineWidth', 1.5, 'Box', 'off');
-xtickangle(90);                  % vertical x-axis tick labels
+set(gca, 'XTick', xd, 'XTickLabelRotation', 90, ...   % vertical x-axis tick labels
+    'FontName', 'Arial', 'FontSize', 13, 'LineWidth', 1.5, 'Box', 'off');
+drawnow;                         % force layout so the rotation is applied headless
 exportgraphics(fig, outFile, 'Resolution', 150);
 close(fig);
 fprintf('%s: wrote %s (anodal N=%d, control N=%d)\n', vname, outFile, na, nc);
diff --git a/analysis/matlab/variations/right_only_d0_13/learning_curve.png b/analysis/matlab/variations/right_only_d0_13/learning_curve.png
index f427c40..01c5ad9 100644
Binary files a/analysis/matlab/variations/right_only_d0_13/learning_curve.png and b/analysis/matlab/variations/right_only_d0_13/learning_curve.png differ
diff --git a/analysis/matlab/variations/right_only_d0_13/learning_curve_rate.png b/analysis/matlab/variations/right_only_d0_13/learning_curve_rate.png
index d54749e..602165e 100644
Binary files a/analysis/matlab/variations/right_only_d0_13/learning_curve_rate.png and b/analysis/matlab/variations/right_only_d0_13/learning_curve_rate.png differ
diff --git a/analysis/matlab/variations/right_only_d0_13/plotcurve.m b/analysis/matlab/variations/right_only_d0_13/plotcurve.m
index 193a44b..8fb7f44 100644
--- a/analysis/matlab/variations/right_only_d0_13/plotcurve.m
+++ b/analysis/matlab/variations/right_only_d0_13/plotcurve.m
@@ -38,8 +38,9 @@ legend([e1 e2], {sprintf('anodal, N = %d', na), sprintf('control, N = %d', nc)},
     'Location', 'northwest', 'Box', 'off');
 xlabel('training day'); ylabel(ylab);
 title(vname, 'Interpreter', 'none');
-set(gca, 'XTick', xd, 'FontName', 'Arial', 'FontSize', 13, 'LineWidth', 1.5, 'Box', 'off');
-xtickangle(90);                  % vertical x-axis tick labels
+set(gca, 'XTick', xd, 'XTickLabelRotation', 90, ...   % vertical x-axis tick labels
+    'FontName', 'Arial', 'FontSize', 13, 'LineWidth', 1.5, 'Box', 'off');
+drawnow;                         % force layout so the rotation is applied headless
 exportgraphics(fig, outFile, 'Resolution', 150);
 close(fig);
 fprintf('%s: wrote %s (anodal N=%d, control N=%d)\n', vname, outFile, na, nc);
diff --git a/analysis/matlab/variations/right_only_d0_5/learning_curve.png b/analysis/matlab/variations/right_only_d0_5/learning_curve.png
index 54d94cf..f734280 100644
Binary files a/analysis/matlab/variations/right_only_d0_5/learning_curve.png and b/analysis/matlab/variations/right_only_d0_5/learning_curve.png differ
diff --git a/analysis/matlab/variations/right_only_d0_5/learning_curve_rate.png b/analysis/matlab/variations/right_only_d0_5/learning_curve_rate.png
index a1ba618..0f4989c 100644
Binary files a/analysis/matlab/variations/right_only_d0_5/learning_curve_rate.png and b/analysis/matlab/variations/right_only_d0_5/learning_curve_rate.png differ
diff --git a/analysis/matlab/variations/right_only_d0_5/plotcurve.m b/analysis/matlab/variations/right_only_d0_5/plotcurve.m
index 193a44b..8fb7f44 100644
--- a/analysis/matlab/variations/right_only_d0_5/plotcurve.m
+++ b/analysis/matlab/variations/right_only_d0_5/plotcurve.m
@@ -38,8 +38,9 @@ legend([e1 e2], {sprintf('anodal, N = %d', na), sprintf('control, N = %d', nc)},
     'Location', 'northwest', 'Box', 'off');
 xlabel('training day'); ylabel(ylab);
 title(vname, 'Interpreter', 'none');
-set(gca, 'XTick', xd, 'FontName', 'Arial', 'FontSize', 13, 'LineWidth', 1.5, 'Box', 'off');
-xtickangle(90);                  % vertical x-axis tick labels
+set(gca, 'XTick', xd, 'XTickLabelRotation', 90, ...   % vertical x-axis tick labels
+    'FontName', 'Arial', 'FontSize', 13, 'LineWidth', 1.5, 'Box', 'off');
+drawnow;                         % force layout so the rotation is applied headless
 exportgraphics(fig, outFile, 'Resolution', 150);
 close(fig);
 fprintf('%s: wrote %s (anodal N=%d, control N=%d)\n', vname, outFile, na, nc);
diff --git a/analysis/matlab/variations/right_only_d6_10/learning_curve.png b/analysis/matlab/variations/right_only_d6_10/learning_curve.png
index 8cedcdd..44ceb42 100644
Binary files a/analysis/matlab/variations/right_only_d6_10/learning_curve.png and b/analysis/matlab/variations/right_only_d6_10/learning_curve.png differ
diff --git a/analysis/matlab/variations/right_only_d6_10/learning_curve_rate.png b/analysis/matlab/variations/right_only_d6_10/learning_curve_rate.png
index 0b6182e..aa8bf70 100644
Binary files a/analysis/matlab/variations/right_only_d6_10/learning_curve_rate.png and b/analysis/matlab/variations/right_only_d6_10/learning_curve_rate.png differ
diff --git a/analysis/matlab/variations/right_only_d6_10/plotcurve.m b/analysis/matlab/variations/right_only_d6_10/plotcurve.m
index 193a44b..8fb7f44 100644
--- a/analysis/matlab/variations/right_only_d6_10/plotcurve.m
+++ b/analysis/matlab/variations/right_only_d6_10/plotcurve.m
@@ -38,8 +38,9 @@ legend([e1 e2], {sprintf('anodal, N = %d', na), sprintf('control, N = %d', nc)},
     'Location', 'northwest', 'Box', 'off');
 xlabel('training day'); ylabel(ylab);
 title(vname, 'Interpreter', 'none');
-set(gca, 'XTick', xd, 'FontName', 'Arial', 'FontSize', 13, 'LineWidth', 1.5, 'Box', 'off');
-xtickangle(90);                  % vertical x-axis tick labels
+set(gca, 'XTick', xd, 'XTickLabelRotation', 90, ...   % vertical x-axis tick labels
+    'FontName', 'Arial', 'FontSize', 13, 'LineWidth', 1.5, 'Box', 'off');
+drawnow;                         % force layout so the rotation is applied headless
 exportgraphics(fig, outFile, 'Resolution', 150);
 close(fig);
 fprintf('%s: wrote %s (anodal N=%d, control N=%d)\n', vname, outFile, na, nc);
diff --git a/analysis/matlab/variations/right_only_d6_13/learning_curve.png b/analysis/matlab/variations/right_only_d6_13/learning_curve.png
index 7b1fc7f..f7a0226 100644
Binary files a/analysis/matlab/variations/right_only_d6_13/learning_curve.png and b/analysis/matlab/variations/right_only_d6_13/learning_curve.png differ
diff --git a/analysis/matlab/variations/right_only_d6_13/learning_curve_rate.png b/analysis/matlab/variations/right_only_d6_13/learning_curve_rate.png
index 455bff5..5f3f43b 100644
Binary files a/analysis/matlab/variations/right_only_d6_13/learning_curve_rate.png and b/analysis/matlab/variations/right_only_d6_13/learning_curve_rate.png differ
diff --git a/analysis/matlab/variations/right_only_d6_13/plotcurve.m b/analysis/matlab/variations/right_only_d6_13/plotcurve.m
index 193a44b..8fb7f44 100644
--- a/analysis/matlab/variations/right_only_d6_13/plotcurve.m
+++ b/analysis/matlab/variations/right_only_d6_13/plotcurve.m
@@ -38,8 +38,9 @@ legend([e1 e2], {sprintf('anodal, N = %d', na), sprintf('control, N = %d', nc)},
     'Location', 'northwest', 'Box', 'off');
 xlabel('training day'); ylabel(ylab);
 title(vname, 'Interpreter', 'none');
-set(gca, 'XTick', xd, 'FontName', 'Arial', 'FontSize', 13, 'LineWidth', 1.5, 'Box', 'off');
-xtickangle(90);                  % vertical x-axis tick labels
+set(gca, 'XTick', xd, 'XTickLabelRotation', 90, ...   % vertical x-axis tick labels
+    'FontName', 'Arial', 'FontSize', 13, 'LineWidth', 1.5, 'Box', 'off');
+drawnow;                         % force layout so the rotation is applied headless
 exportgraphics(fig, outFile, 'Resolution', 150);
 close(fig);
 fprintf('%s: wrote %s (anodal N=%d, control N=%d)\n', vname, outFile, na, nc);
diff --git a/analysis/matlab/variations/unmerge_d0_10/learning_curve.png b/analysis/matlab/variations/unmerge_d0_10/learning_curve.png
index 5089669..fbdf57c 100644
Binary files a/analysis/matlab/variations/unmerge_d0_10/learning_curve.png and b/analysis/matlab/variations/unmerge_d0_10/learning_curve.png differ
diff --git a/analysis/matlab/variations/unmerge_d0_10/learning_curve_rate.png b/analysis/matlab/variations/unmerge_d0_10/learning_curve_rate.png
index 0b30787..139bacd 100644
Binary files a/analysis/matlab/variations/unmerge_d0_10/learning_curve_rate.png and b/analysis/matlab/variations/unmerge_d0_10/learning_curve_rate.png differ
diff --git a/analysis/matlab/variations/unmerge_d0_10/plotcurve.m b/analysis/matlab/variations/unmerge_d0_10/plotcurve.m
index 193a44b..8fb7f44 100644
--- a/analysis/matlab/variations/unmerge_d0_10/plotcurve.m
+++ b/analysis/matlab/variations/unmerge_d0_10/plotcurve.m
@@ -38,8 +38,9 @@ legend([e1 e2], {sprintf('anodal, N = %d', na), sprintf('control, N = %d', nc)},
     'Location', 'northwest', 'Box', 'off');
 xlabel('training day'); ylabel(ylab);
 title(vname, 'Interpreter', 'none');
-set(gca, 'XTick', xd, 'FontName', 'Arial', 'FontSize', 13, 'LineWidth', 1.5, 'Box', 'off');
-xtickangle(90);                  % vertical x-axis tick labels
+set(gca, 'XTick', xd, 'XTickLabelRotation', 90, ...   % vertical x-axis tick labels
+    'FontName', 'Arial', 'FontSize', 13, 'LineWidth', 1.5, 'Box', 'off');
+drawnow;                         % force layout so the rotation is applied headless
 exportgraphics(fig, outFile, 'Resolution', 150);
 close(fig);
 fprintf('%s: wrote %s (anodal N=%d, control N=%d)\n', vname, outFile, na, nc);