Photochemical calculations for a TRAPPIST-1 e anoxic atmosphere for a wide variety of CO₂ pressure logarithmically spaced between 10⁻³ (1000 ppmv) and 0.5 bars (50% v/v) and CH₄ flux logarithmically spaced between 0.1 and 100 Tmol yr⁻¹ (approximately between 4 × 10⁹ molecules cm⁻² s⁻¹ and 5 × 10¹¹ molecules cm⁻² s⁻¹). The left panel shows surface CH₄ mixing ratios. The contour lines correspond to CH₄ mixing ratios of 1, 10, 100, 1000, and 10,000 ppm (left to right). The right panel shows the column density of hydrocarbon haze particles in cm². The dashed red line indicates the approximate τ = 1 extinction contour at 550 nm. Only at the highest CH₄ does haze become significant. Calculations assume a 1-bar atmosphere with N₂ as the filling gas and include the formation of fractal hydrocarbon hazes.