Hi I’ve noticed that in some .ion and .iod files TEQC places an I after some values, as in the second line of data 9 5 14 18 26 30 34 53 54 55 0.044 0.055 -0.174 -0.249 0.032 0.022I 0.089 0.052 0.569 Does it mean anything or is it a bug? Best regards Maria Joao Henriques