title: Matplotlib placement of text e.g. suptitle inside the frame
body: <p>So far i have placed my suptitles above the frame, like this:</p>
  
  <p><img src="https://i.stack.imgur.com/j55xB.png" alt="enter image description here"></p>
  
  <p>How can i get the suptitles from <strong>above</strong> the frame <strong>into the frame?</strong></p>
  
  <p>So far i have a solution that just prints a text and sets it on the right position with computing xlim and ylim. However this is errorprone and if the text is different it just looks aweful. Is there a way to set the suplabel into the frame? Or just place text below the frame and centered?
  it would be really convenient, if i did not need to know about the data that is displayed inside the frame. </p>