126.96.36.199 is referring to the numbers which are values along the axis line -- those that label the ticks -- specifically on line graphs. Since a line graph is usually the upper right quadrant (6.6.4) there would not be negative values.
Please provide a scan of the example in question, so that we can determine whether it is a Cartesian graph or a line graph. 188.8.131.52 is referring to lines on a Cartesian graph and in 184.108.40.206 is says that the numeric indicator is [u]not[/u] used on Cartesian graphs regardles of whether they are transcribed in literary or Nemeth code.
Many transcribers get confused over the differences between a line graph and a Cartesian graph. Hopefully when you provide a scan, we will be able to clarify the intent of the Guidelines.