The first column in Table 1 indicates the spacecraft (Helios 1 or Helios 2), in the second column is the time for the observation of the MC center (or for the minimum approach distance). The MCs are separated in two groups: perturbed (P) and non-perturbed (N) by a fast SW stream. is minus the fitted slope of the temporal velocity profile (see, Eq. (2)) and is the non-dimensional expansion coefficient (Eq. (8)). means observed compression of the MC. The average values and the standard deviations are given at the bottom.
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