title: Wolfram Mathematica: y-axis frame labels are not aligned
body: <p>I'm producing a double panel figure in Mathematica. The Bottom panel has negative values on the y-axis and this causes the label on that axis, produced using FrameLabel, to be aligned a bit more to the left than the label on the top panel, which has positive values. I cannot join the panels to a single plot because the scales are different.
  A piece of code that reproduces the problem:</p>
  
  <pre><code>pad = 80;
  Export["C:\\Users\\user\\Desktop\\stackoverflow.png",
   Column[
    {
     Show[
      Plot[ Sin[x]^2, {x, 0, Pi},
       FrameLabel -&gt; {"", "y"},
       BaseStyle -&gt; {FontSize -&gt; 16, FontWeight -&gt; Bold, 
         FontFamily -&gt; "Calibri"},
       ImagePadding -&gt; {{pad, pad/4}, {pad, pad/4}},
       Frame -&gt; {True, True, True, True}
       ]
      , ImageSize -&gt; 640]
     ,
     Show[
      Plot[ -Sin[x]^2/1000, {x, 0, Pi},
       FrameLabel -&gt; {"x", "y"},
        BaseStyle -&gt; {FontSize -&gt; 16, FontWeight -&gt; Bold, 
         FontFamily -&gt; "Calibri"},
       ImagePadding -&gt; {{pad, pad/4}, {pad, pad/4}},
       Frame -&gt; {True, True, True, True}
       ]
      , ImageSize -&gt; 640]
     }
    ]
   ]
  </code></pre>
  
  <p>This code produces the following figure, in which you can see that the y label is aligned differentyl in the top and bottom panels. 
  <img src="https://i.stack.imgur.com/JbQhM.png" alt="misaligned y labels"></p>
  
  <p>I would appreciate any help - I have to submit the figure (obviously no the above figure...) to the publisher ASAP for my paper to go to print...
  Thanks</p>