Expansion Velocities for Shells with Q_exp ≥ 4.0

Note: "..." signifies no identification of shell wall was possible

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• ^a Front wall estimate may be possibly unrelated gas, or suffer from data quality issues.
• ^b Estimated V_exp lower limit uses V₁ and V_b
• ^c Rear wall estimate may be possibly unrelated gas, or suffer from data quality issues.
• ^d Estimated V_exp lower limit uses V_f and V₂
• ^e Based on raw spectrum.
• ^f Expansion velocity might be underestimated because at least one maximum in spectrum is broad and/or peaks at a velocity very close to last shell-like velocity.
• ^g Clear maximum on one side, but no clear minimum in spectrum.
• ^h Spectrum complex, and constantly changing histogram limits required to follow its morphology vs. velocity.