Opacity.

app.py

@@ -287,8 +287,9 @@ def build_accuracy_figure(tier: str):
                 x=[date_str],
                 y=[y],
                 mode="markers",
+                opacity=0.85,
                 name=model,  # distinct legend entry & color per model
-                marker=dict(size=8, opacity=0.55, line=dict(width=0.5)),
+                marker=dict(size=8, opacity=0.85, line=dict(width=0.5)),
                 cliponaxis=False,  # let markers render over axes
                 hovertemplate=(
                     f"<b>{model}</b><br>"