$\pt$-differential inclusive cross section for prompt $\rm D_s^+$ meson production in $\rm pp$ collisions at $\sqrt{s}=7$. TeV The symbols are positioned horizontally at the centre of each $\pt$ interval. The horizontal error bars represent the $\pt$ interval width. The normalization uncertainty (3.5% from the minimum-bias crosssection and 5.3% from the branching ratio uncertainties) is not shown. Theoretical predictions from GM-VFNS and from $\kt$-factorization at LO are also shown.