>Yamaoka did not give any errors for his reductions; Oh, sorry. The fitting error for each measurement is about 0".3. And, the dispersion between four measurements is around (or smaller than) 0s.01 and 0".1. It is because I gave 0s.001 and 0".01 digit. I think the positions given by Gianluca, Arne and me agree very well, and also with USNO-A2.0 position. >Since Yamaoka-san notes a fainter companion, >you should be careful on your photometry as the CV fades. But every DSS image shows the USNO star far brighter than a dim star I noted. I guess this dim star will not affect large for the photometry even on quietience. Sincerely Yours, Hitoshi Yamaoka