As mentioned in the previous post, there are many excellent female sci-fi authors out there - even those who dabble in Hard SF. Some, like Doris Lessing, mixes fantasy with sci-fi, like what Heinlein did. And she, like some of the others, besides ideas, have wonderful prose.
I am glad I did this list. Hopefully, more of them will be mentioned in the same breath when people talk about female authors in sci-fi. And I do hope this list encourages more girls and women to read and write sci-fi.
Note: To view the charts clearer, right click over them and choose "Open link in new window." That will allow you to zoom in as well.