r - ggplot - change size of dots -

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i plotting points on graph ggplot , geom_point. size of dots corresponds magnitude of data point. magnitude goes 2 10. draw dots applying factor of 0.5 magnitude sizes go 1 5. in legend, on side of graph, show real magnitude 2 10.

how can that?

there 2 possibilities:

1) divide magnitude 2:

geom_point(aes(size = magnitude/2))

2) use range = c(1,5) parameter:

geom_point(aes(size = magnitude)) + scale_size(range = c(1,5))

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