WF centre and spread    1  ( -0.000005,  0.000021,  0.000023 )     2.56218734
WF centre and spread    2  (  0.000013, -0.000054,  0.000016 )     3.19493515
Sum of centres and spreads (  5.430528,  5.430529,  5.430534 )    24.29446759
