
s10=read_gdf('data/traj10')
s20=read_gdf('data/traj20')
s30=read_gdf('data/traj30')

; different time series had different timesteps
time10=findgen(n_elements(s10))*10   ;0.1h
time20=findgen(n_elements(s20))*0.2  ;0.2g
time30=findgen(n_elements(s30))*1    ;0.3b

