Cross sections of the carbon atom in \AA$^2$ for direct ionization, excitations to the 2s2p$^3\ ^3$S$_1$ autoionizing level, and for the total ionization as functions of the incident electron energy $T$ in eV. T Direct Excitation Total 2s^2 2p^2 ^3P -- 2s 2p^3 ^3S 12 & 0.0526 & 0 & 0.0526 14 & 0.243 & 0.120 & 0.362 16 & 0.423 & 0.202 & 0.625 18 & 0.582 & 0.248 & 0.831 20 & 0.737 & 0.279 & 1.016 25 & 1.116 & 0.323 & 1.439 30 & 1.391 & 0.345 & 1.736 35 & 1.587 & 0.354 & 1.942 40 & 1.726 & 0.358 & 2.084 45 & 1.823 & 0.357 & 2.180 50 & 1.890 & 0.354 & 2.244 60 & 1.963 & 0.344 & 2.307 70 & 1.985 & 0.332 & 2.317 80 & 1.978 & 0.319 & 2.297 90 & 1.954 & 0.307 & 2.261 100 & 1.920 & 0.295 & 2.215 120 & 1.838 & 0.273 & 2.111 150 & 1.708 & 0.245 & 1.953 180 & 1.586 & 0.222 & 1.807 200 & 1.511 & 0.209 & 1.720 250 & 1.349 & 0.183 & 1.532 300 & 1.218 & 0.163 & 1.380 350 & 1.110 & 0.147 & 1.257 400 & 1.021 & 0.134 & 1.155 450 & 0.945 & 0.124 & 1.069 500 & 0.881 & 0.115 & 0.995 600 & 0.776 & 0.100 & 0.876 700 & 0.695 & 0.0896 & 0.784 800 & 0.630 & 0.0810 & 0.711 900 & 0.577 & 0.0740 & 0.651 1000 & 0.532 & 0.0683 & 0.601 2000 & 0.308 & 0.0394 & 0.347 3000 & 0.220 & 0.0283 & 0.248 4000 & 0.173 & 0.0223 & 0.195 5000 & 0.143 & 0.0185 & 0.161