<br />
<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_cdisnc9vdaj6mkfht7qk8oroi6, O_RDWR) failed: No space left on device (28) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
<br />
<b>Warning</b>:  session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
static double pixelSetRectangleness(PixelSet set) {
  L<IntRange> l = pixelSetBoundsByLine(set);
  int[] a = intRangeStarts(l), b = intRangeEnds(l);
  double avgL = doubleAverage(a), avgR = doubleAverage(b);
  double width = avgR-avgL;
  double dev = standardDeviation(b)+standardDeviation(a);
  print("width=" + width + ", dev=" + dev);
  ret max(0, 1-dev/width);
}