data = c( 0.87, 0.72, 1.30, 1.05, 0.79, 0.61, 1.45, 1.01, 1.15, 0.20, 1.31, 0.67, 1.09, 1.35, 0.66, 1.27, 0.49, 1.28, 1.40, 1.55 )