Frequencies in PSD are listed twice

I noticed from PSDs provided by @carl-johan.haster and @sophie.hourihane have the frequency arrays repeated. For example, from /home/sophie.hourihane/public_html/BayesWaveRuns/O4/G1124251/cleanOnlyGW1124251_7523_8s/trigtime_1372281638.255000114_0.0_0.0_0/post/clean/glitch_median_PSD_forLI_L1.dat, we see in frequency vs index that all frequencies are repeated.