From c35ab2b2ef035de2ee5e4d16d68c31720529010e Mon Sep 17 00:00:00 2001
From: Andrew Barnes <andrew.jaguars@gmail.com>
Date: Tue, 3 Mar 2026 12:42:15 -0500
Subject: [PATCH] Fix notebook: remove unused tol variable from SVI calibration
 cell

The EquityVolSurface.check_calibration() method only accepts a single
argument (verbose: bool), but the notebook previously called it with
(False, tol). The call was fixed to check_calibration(False) but the
unused tol = 1e-4 assignment was left behind. Remove it.

Closes #226
---
 .../market/volatility/EquityVolSurfaceConstructionSVI.ipynb      | 1 -
 1 file changed, 1 deletion(-)

diff --git a/notebooks/market/volatility/EquityVolSurfaceConstructionSVI.ipynb b/notebooks/market/volatility/EquityVolSurfaceConstructionSVI.ipynb
index 74e7d6a0..27655da0 100644
--- a/notebooks/market/volatility/EquityVolSurfaceConstructionSVI.ipynb
+++ b/notebooks/market/volatility/EquityVolSurfaceConstructionSVI.ipynb
@@ -244,7 +244,6 @@
                 }
             ],
             "source": [
-                "tol = 1e-4\n",
                 "equitySurface.check_calibration(False)"
             ]
         },