Slopes, winds, and wave heights. Here we plot output from the Donelan et al.  wave model using the Titan parameters from Hayes et al. . As the solid line we plot the expected RMS surface slope (our σ) is as a function of the wind speed as measured 10 meters above the surface (U10). From that relation we infer winds of 0.76±0.09 m/s in our target areas at the time of the observation. We also plot as the dashed line the significant wave height (defined to be 4 times the RMS in the liquid height across the surface) as a function of U10, with the scale on the right-hand side of the plot. We therefore infer significant wave heights ofcm.