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2 changes: 1 addition & 1 deletion tidy3d/components/medium.py
Original file line number Diff line number Diff line change
Expand Up @@ -163,7 +163,7 @@ def eps_sigma_to_eps_complex(eps_real: float, sigma: float, freq: float) -> comp
complex
Complex-valued relative permittivity.
"""
if not freq:
if freq is None:
return eps_real
omega = 2 * np.pi * freq
return eps_real + 1j * sigma / omega
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