- Give 'fit formula' title a h3 header tag
- Don't show the fit formula if 'NaN' if present, instead show 'fit not
  Possible'
- Add minimum of 0.6 instead of zero to avoid fit line overflow at y=0
- Format key for table headers to show the sexier names
- Add text-align center to the preview div to make 'fit not possible'
  also centered