 20 ecart_type_moyen=   2.79692483
  82.3714371  473.773651  2.79692507  1187.56104
  121.716835  432.853271  2.79692507  1084.98999
  147.664398  3737.58472  2.79692507  9368.62988
  249.438889  150.89325  2.79692507  378.229004
  373.85495  5041.59619  2.79692507  12637.2646
  455.955444  1865.78284  2.79692507  4676.771
  461.716339  1495.47168  2.79692507  3748.54907
  468.740906  2532.80151  2.79692507  6348.72021
  475.788849  1167.83557  2.79692507  2927.29663
  482.954529  1496.66577  2.79692507  3751.54224
  506.415283  14079.1172  2.79692507  35290.7148
  534.060303  330.578094  2.79692507  828.627014
  538.847168  557.273438  2.79692507  1396.86157
  546.415833  1187.39661  2.79692507  2976.32812
  589.083313  288.19165  2.79692507  722.381165
  614.557495  211.829803  2.79692507  530.972595
  666.764343  249.446701  2.79692507  625.263062
  685.806213  472.553436  2.79692507  1184.50244
  706.235046  434.880768  2.79692507  1090.07214
  710.358765  479.869263  2.79692507  1202.84021
