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mwaskom__seaborn-3407

Based on my knowledge of seaborn's codebase and the error described, I can create the patch. The issue is that when a DataFrame has a MultiIndex for columns, the PairGrid class in axisgrid.py extracts variable names incorrectly. The…

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Content

Based on my knowledge of seaborn's codebase and the error described, I can create the patch. The issue is that when a DataFrame has a MultiIndex for columns, the `PairGrid` class in `axisgrid.py` extracts variable names incorrectly. The problem occurs in the `__init__` method of `PairGrid` where it gets numeric columns from the DataFrame - with a MultiIndex, `df.columns.tolist()` returns tuples, not strings, and these tuples cannot be used to index the DataFrame using `df[var]`.

The fix needs to be in the `PairGrid.__init__` method where it extracts numeric columns. When the DataFrame has a M

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