The Collective Thomson scattering technique has been implemented to study the stagnation of a single liner gas-puff. The plasma parameters are determined by theoretically modelling the scattering form factor in combination with Bayesian inference to provide the set of the most probable parameters that describe the experimental data. Analysis of the data reveal that incoming flows are able to interpenetrate partially. Estimation of the mean free path shows a gradual transition from a weakly collisional to a collisional regime as the plasma gets to the axis. Furthermore, we find that the ion energy at Formula: see text is Formula: see text and is mostly kinetic in nature and represents Formula: see text of the total energy. This kinetic energy is far greater than the value on axis of Formula: see text which is Formula: see text of the total energy. Energy transfer to the electrons and radiation losses are found to be negligible by this time. A possible explanation for this energy imbalance is the presence of an azimuthal magnetic field larger than Formula: see text that deflect the ions vertically. The uncertainties quoted represent 68% credible intervals.