Dispersion relation of the turbulence in the reconnecting current sheet derived by the interferometry method. (a) ﹩{P/P}_{\max }﹩ as a function of frequency f and wavenumber ﹩\left|{\boldsymbol{k}}\right|﹩; (b) ﹩{{P}{/}{P}}_{\max }﹩ as function of ﹩{{\boldsymbol{k}}}_{L}﹩ and ﹩{{\boldsymbol{k}}}_{M}﹩, and (c) ﹩{{\boldsymbol{k}}}_{L}﹩ and ﹩{{\boldsymbol{k}}}_{N}﹩. The red dashed line in panel (a) denotes the maximum phase speed from the dispersion relation.