1. An Alternate Perspective Most development on 10-50 ton detectors –~500 GW-ton-years –Systematics limited for rate measurement Lots of thought about systematics –Insuring identical detectors –Moving detectors? Discussions involve large costs to improve confidence in measurement

2. What about the Spectrum? Shape Test:  Minimizes Detector Specific Systematics  Loss of overall rate information

3. Is There Enough Luminosity? 500 ton Detector

4. Spectrum Ratio

5. What is a 500 ton Detector? Fiducial radius = 4.92m 3 volume radius = 6.27m Surface area (number of PMTs) goes up by factor 3-4 Cost would similarly scale

6. Can We Handle a Big Detector? For 3 Volume Design 20% PMT Coverage

7. Effect on Energy Resolution