tokens: around 65% and 41%, and the uncertainties in their speeds give a likelihood of perfectly inelastic collision of around 98% and 100%, respectively. Similarly, the uncertainties in the propagation directions of the 2012 June and 2011 August CMEs give a likelihood of inelastic collision of around 65% and 77%, the uncertainties in their angular widths give a likelihood of inelastic collision of around 50% and 53%, and the uncertainties in their speeds give a likelihood of inelastic collision of around 94% and 84%, respectively. For the 2013 October CMEs, the uncertainties in the propagation directions, widths, and speeds correspond to a probability of 67% for super-elastic collision, 75% for inelastic collision, and 50% for super-elastic collision, respectively. The uncertainties in the directions of the 2011 February, 2012 March, and 2012 September CMEs give a likelihood of super-elastic collision of around 88%, 38%, and 89%, the uncertainties in their widths give a likelihood of super-elastic collision of around 73%, 43%, and 60%, while the uncertainties in their speeds give a likelihood of super-elastic collision of around 89%, 61%, and 49%, respectively. From the above values of probabilities and the values of e shown in Figures 4 – 11 , we note that the effect of the uncertainties is so large for some cases that it is difficult to ascertain a particular nature of collision for those cases. For instance, under the uncertainties considered, three cases (CMEs of 2010 May 23–24, 2013 October 25, and 2012 September 25–28) of the CMEs show the most probable nature of collision vacillating between the inelastic to super-elastic regime. Such an effect is expected for the CMEs of 2013 October 25 as its observed nature of collision was elastic, i.e., at the boundary of the inelastic and super-elastic. However, the CMEs of 2010 May show huge uncertainties in the e value in their directions, widths, and speeds. The CMEs of 2012 September 25–28 show a large deviation from the super-elastic nature due to uncertainties in the pre-collision leading edge speeds of the CMEs. Such uncertainty in the e value due to a change in the speed of the CMEs was not noted in Mishra et al. ( 2015b ). We point out that in the oblique collision scenario, even a reasonable uncertainty in the observed CME characteristics leads to a different nature of collision. The e value is found to be dependent to some extent on the relative propagation directions of the CMEs. However, this was not recognized in earlier studies that assumed the head-on collision scenario (Mishra et al. 2014 , 2015a ). We envisage that a change in the propagation directions may lead to a change in the relative contribution of the expansion speeds to the centroids speeds of the CMEs along the line joining their centroids. We did not make any attempts to understand whether the different propagation directions of the CMEs, which cause different contact areas between them, have some role in deciding the nature
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