<p>Each panel was composed of a colorimetric bar, traction force field and phase-contrast image. The recovered traction fields of <b>A</b>, <b>B</b>, <b>C</b>, <b>D</b>, <b>E</b>, <b>F</b>, <b>G</b> and <b>H</b> were only a part of the total traction force fields in one petri dish.</p