| Figure 2. | Measured methane absorption near 2999 cm-1. Taken long path, retro-reflector range is 1.487 km (0.92 miles). Measured value is 2.7 ppm. |
| Figure 2. | Measured methane absorption near 2999 cm-1. Taken long path, retro-reflector range is 1.487 km (0.92 miles). Measured value is 2.7 ppm. |