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}
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}
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\usage{quakes}
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\usage{quakes}
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\format{
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\format{
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  A data frame with 1000 observations on 5 variables.
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  A data frame with 1000 observations on 5 variables.
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  \tabular{rlll}{
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  \tabular{rlll}{
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    [,1] \tab lat      \tab numeric \tab Latitude of event\cr
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    [,1] \tab \code{lat}      \tab numeric \tab Latitude of event\cr
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    [,2] \tab long     \tab numeric \tab Longitude\cr
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    [,2] \tab \code{long}     \tab numeric \tab Longitude\cr
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    [,3] \tab depth    \tab numeric \tab Depth (km)\cr
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    [,3] \tab \code{depth}    \tab numeric \tab Depth (km)\cr
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    [,4] \tab mag      \tab numeric \tab Richter Magnitude\cr
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    [,4] \tab \code{mag}      \tab numeric \tab Richter Magnitude\cr
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    [,5] \tab stations \tab numeric \tab Number of stations reporting
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    [,5] \tab \code{stations} \tab numeric \tab Number of stations reporting
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  }
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  }
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}
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}
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\source{
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\source{
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  This is one of the Harvard PRIM-H project data sets.  They in turn
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  This is one of the Harvard PRIM-H project data sets.  They in turn
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  obtained it from Dr. John Woodhouse, Dept. of Geophysics, Harvard
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  obtained it from Dr. John Woodhouse, Dept. of Geophysics, Harvard