Calculate the transmembrane pressure in bar for: $p_{\text{f}\text{e}\text{e}\text{d}}=2\mathrm{.}5$ bar, $p_{\text{r}\text{e}\text{t}\text{e}\text{n}\text{t}\text{a}\text{t}\text{e}}=1\mathrm{.}4$ bar, $p_{\text{p}\text{e}\text{r}\text{m}\text{e}\text{a}\text{t}\text{e}}=0\mathrm{.}5$ bar. Give the result rounded to $2$ decimal digits without units in the answer field $(1\mathrm{.}11).$