Log GC status to a file with time stamps

Hi,
I ran a java app using java -Xms64M -Xmx256M -Xloggc:GClog.txt
and it prints out the following to the file GClog.txt
0.000: [GC 4095K->276K(65088K), 0.0113338 secs]
Can anyone pls tell what all these numbers mean
I know what the 65088K means. It's the initil heap size,
but i'm not sure how to interpret 4095K->276K
Thanks

Amount of heap allocated/used/whatever-the-term-is before and after GC.

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