Sixty-one-day mean neutral temperature for the control case (MC2008; panel a) and the difference with C1908, M1908, and MC1908 (panels b–d) at 12 LT at a pressure level of 3.2 × 10⁻⁸ hPa (~300 km). The contour interval for the difference plots is 2 K between −12 and +12 K, with an additional contour at −16 K for the bottom panel. Light (dark) shading indicates statistical significance at the 95% (99%) level.