With this paper the 21 cm Galactic plane survey project carried out with the Effelsberg 100-m telescope is completed. A similar Galactic plane survey at 11 cm wavelength is already available (Reich et al. 1990b; Fürst et al. 1990). Both surveys and other radio continuum surveys can be accessed in FITS-format via the World Wide Web (http://www.mpifr-bonn.mpg.de/survey.html). Details of the access and the retrieval software have been described by Fürst et al. (1997) and is also available at the given World Wide Web address.
Acknowledgements
We like to thank O. Lochner and his group for support and help with selecting observing bands free of interference. We are grateful to R. Wielebinski for his continuous support and interest in the Effelsberg continuum surveys. We thank J. Lequeux for helpful comments.