I would like to use the data below where the plots are close to what I
want.  Instead of color I would like to use different symbols, and
have the symbols in the legend match the graphs.  I am also going to
add a regression line to these I know about the type="r" (which is
fine for these particular graphs) argument, but it fits the subsets
instead of the entire data set-- should I use a list of regression
fits in the order of the arguments in an abline panel to do this?  Ok,
I think that is all for right now.  If I need to clarify please tell
me.
thanks

f <- structure(list(GPP = c(1.213695235, 3.817313822, 1.267930498,
10.45692825, 3.268295623, 3.505286001, 4.468225245, 0.915653726,
1.635617261, 3.726133898, 1.363453706, 13.99650967, 0.417618143,
0.741080504, 0.412440872, 3.515743675, 8.248491445, 1.537773727,
3.249103284, 0.768531626, 2.633107621, 3.113199095, 0.773824094,
0.680150068, 0.026385752, 0.369310858, 8.049276658, 7.487378383,
0.763580377, 0.333244629, 5.475999014, 9.235631398), TSS = c(2.8,
8.4, 11, 1.3, 4.2, 2, 3.4, 14, 8.2, 3.1, 1.4, 0.9, 6.1, 9.2,
11, 1.2, 1.3, 11, 8.5, 13, 4.4, 1.4, 2.1, 25, 9.3, 6.1, 1.6,
1.5, 24, 9.6, 1.8, 1.4), Iron = c(0.74, 0.54, 0.23, 0.13, 0.4,
0.13, 0.15, 0.58, 0.38, 0.22, 0.13, 0.07, 0.32, 0.26, 0.86, 0.13,
0.09, 0.58, 0.35, 0.59, 0.33, 0.19, 0.21, 0.81, 0.34, 0.31, 0.07,
0.16, 0.54, 0.36, 0.13, 0.07), TIN.TP = c(3.117647059, 2.736842105,
2.25, 22, 3, 2.428571429, 6.428571429, NA, NA, 2.384615385, 3,
NA, 3.25, NA, 3.166666667, 9, 23, 3.5, 11, 3.916666667, 3.4,
3.444444444, 8.75, 2.733333333, 3.583333333, 2.75, 17, NA, 2.933333333,
2.533333333, 2.5, 11), RiverMile = c(148L, 179L, 185L, 202L,
179L, 185L, 190L, 119L, 148L, 179L, 185L, 202L, 119L, 202L, 148L,
190L, 202L, 148L, 202L, 119L, 179L, 185L, 190L, 61L, 119L, 148L,
202L, 202L, 119L, 148L, 185L, 202L)), .Names = c("GPP", "TSS",
"Iron", "TIN.TP", "RiverMile"), class = "data.frame", row.names = c(1L,
2L, 3L, 5L, 6L, 7L, 8L, 9L, 10L, 11L, 12L, 13L, 15L, 16L, 19L,
22L, 23L, 30L, 34L, 36L, 37L, 38L, 39L, 43L, 44L, 45L, 46L, 47L,
49L, 50L, 51L, 52L))

xyplot(GPP~(1/Iron)+(1/TSS)+TIN.TP, groups=RiverMile,data=f,
scales=list(relation="free"), pch=20, auto.key=TRUE)

-- 
Stephen Sefick
Research Scientist
Southeastern Natural Sciences Academy

Let's not spend our time and resources thinking about things that are
so little or so large that all they really do for us is puff us up and
make us feel like gods. We are mammals, and have not exhausted the
annoying little problems of being mammals.

        -K. Mullis

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