tokens: ACKNOWLEDGEMENTS We would like to sincerely thank the referee for a critical review which proved to be crucial for this study. We acknowledge the work of people involved in the designing, construction and deployment of the COS onboard HST . We also wish to extend our thanks to all those who had carried out data acquisition through Far-UV observations towards the sightlines mentioned in this paper. The plots in Figs 2 , 3 , and 9 were generated using the graphics environment developed by Hunter ( 2007 ).
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