A binary feed consisting of $25$ mol$\%$ liquid and $75$ mol$\%$ vapour is separated in a staged distillation column. The mole fraction of the more volatile component in the distillate product is $0.95$. The molar flow rate of distillate is $50\%$ of the feed flow rate and the McCabe-Thiele method can be used to analyze the column. The $q$-line intersects the operating line of the enriching section at $(0.35, 0.5)$ on the $x-y$ diagram. The slope of the stripping section operating line (up to one decimal place) is ___________ .