[R] how to draw abline correctly?

[aegea]

Hello, I am frastruated with this graph, just cannot get what I need. Thank
you for any suggestions or help. I really appreciate it. I wrote the
following code, but there are 3 problems

1, the red line is added on the graph but without any marker on the y-axis. 
I want to display the number '.1361' on the y-axis. So people can easily
tell 'method 2' gets a constant estimate, which is 0.1361.

2, since 'method2' is a constant. I prefer in the legend area, it just shows
'method2' as a short red bar instead of a knot/spot in the middle of the red
bar  in the legend area. How can I delete that spot?

3, when I draw 'method1' in blue one, I prefer a filled/shaded circle
instead of the unshaded circle. I tried pch='.', seems it does not really
work.

Hopefully I make my question clear. Thanks a lot for any help!



size=c(80, 40, 20, 16, 10, 8, 4, 2)
estimate=c(0.1353, 0.1337, 0.1237, 0.1164,  0.1058, 0.0983, 0.0759 , 0.0607)
plot(size, estimate, type="o", lwd=1.5, col="blue", ylim=c(0, 0.2),
xlim=c(0,80))
abline(h=0.1361, col="red", lwd=1.5)
legend(0, 0.2,c("method1","method2"), cex=0.8,    col=c("blue","red"),
pch=21:1, lty=1);

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