The width of the absorption dip for CO2 is measured to be about 2.5 MHz, five absorption dips for SF6 are observed in the experiments, and the dip width is about 1.9MHz.

• 测量CO_2的吸收凹陷约为2.；5MHz；实验中观察到5个SF_6的吸收凹陷、凹陷深率约为1