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Secondary axis with twinx(): how to add to legend?

I have a plot with two y-axes, using twinx() . I also give labels to the lines, and want to show them with legend() , but I only succeed to get the labels of one axis in the legend: ...
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Vim Insert Mode on Mac OS X

Apparently Mac keyboards don't have an Insert key (or maybe they do but I can't find it). How can I get to insert mode in vim on a Mac? ...
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What is the 'cls' variable used for in Python classes?

Why is cls sometimes used instead of self as an argument in Python classes? 5 Answers ...
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How do you clear the SQL Server transaction log?

I'm not a SQL expert, and I'm reminded of the fact every time I need to do something beyond the basics. I have a test database that is not large in size, but the transaction log definitely is. How do I clear out the transaction log? ...
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What is “rvalue reference for *this”?

Came across a proposal called "rvalue reference for *this" in clang's C++11 status page . 3 Answers ...
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Why are only final variables accessible in anonymous class?

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Accessing the web page's HTTP Headers in JavaScript

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Newline in JLabel

How can I display a newline in JLabel ? 6 Answers 6 ...
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How is pattern matching in Scala implemented at the bytecode level?

How is pattern matching in Scala implemented at the bytecode level? 3 Answers 3 ...
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How to urlencode data for curl command?

...e a bash script for testing that takes a parameter and sends it through curl to web site. I need to url encode the value to make sure that special characters are processed properly. What is the best way to do this? ...