SPIRAL DISK SIMULATIONS illustrate HST's ability to recover the velocity-delay structure of an AGN accretion disk with spiral density waves.

On each HST orbit, expose 1260s with G140L and 560s with G230L.

Repeat every dt=1 days for T=100 days.

True maps: emissivity , responsivity .

Synthetic data: Lya , CIV , HeII .

Spectra: 1st , avg,rms .

Sampled lightcurves: 1380A , Lya, CIV, HeII.

1-D MEMECHO maps Psi(tau): Chi2= 3 , 2 , 1 . iter .

2-D MEMECHO maps Psi(v,tau):

G140L map , fit , dat , (dat-fit), (dat-fit)/sig , iter .

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Keith Horne (kdh1@st-andrews.ac.uk)