W.J. Schuster, L. Parrao and J. Guichard
The individual nightly determinations of the atmospheric extinction above San Pedro M\'artir (SPM) are presented from 82 nights of 13-color observations over the years 1980-1983 and from 287 nights of uvby observations over the years 1984-1999. Monthly and yearly averages are also given and compared for the years 1973-1999.
Manuscript: jad8_2.ps
Tables data files (ASCII): Table1, Table2, Table3, Table4, Table5, Table6, Table7, Table8, Table9, Table10, Table11