Ooops, Shame on me, first posting and it was a mistake in the To: field. Anyway, the problem is that SDSS spectra are log lambda spaced instead of lambda. Then a previous scrunch is needed to allow dipso to use those spectra. Sorry again -- Jaime D. Perea Duarte. <jaime at iaa dot es> Linux registered user #10472 Dep. Astrofisica Extragalactica. Instituto de Astrofisica de Andalucia (CSIC) Apdo. 3004, 18080 Granada, Spain.