$B(\bk,\bl,\bmm)=B(-\bk,\bmm,\bl)^*=B(\bmm,-\bk,\bl)^*$ and as the bispectrum is real in our case, this location has the same bispectral value as a location near the negative peaks in the middle panel in Figure \[figbicoh\]. The pattern associated with these negative values and the associated Fourier components is a pattern made of asymmetric rolls, where the regions of outflow are slightly larger than the regions of inflow. This is consistent with the observation that hexagons with a positive bicoherence also have regions of outflow that are larger in diameter than the inflow regions.

![image](fig3-1){width="0.32\linewidth"} ![image](fig3-2){width="0.32\linewidth"} ![image](fig3-3){width="0.32\linewidth"}

Generating synthetic data {#secresultsweak}
-------------------------

We generate synthetic data with approximately the given measured power spectrum and bispectrum using the method described in Section \[secgenerate\]. As [there is not a unique way to do so, this]{} is [only]{} one possible model for the data. Figure \[figsynthexample\] shows an example realization of the synthetic LCT data (second row, left column). For comparison, the panel directly below shows an example realization of the LCT data. The synthetic and the real data are very similar and a difference can hardly be seen by eye, apart from the fact that the synthetic data are periodic. Figure \[figsynthexampleTD\] shows the corresponding results for 