Figure 7: Minimum science requirements for the technologies of the last three eras in Civ 5, as plotted by TTT. (In order to improve the image quality for publication, the figure was redrawn based on a TTT screen capture.) Distinct techs are represented on their corresponding rows, and the horizontal locations of circles (their midpoints) represent the OC values of the corresponding techs. OC values increase linearly along the horizontal axis from left to right, as indicated.