What is the Difference Between Out Of Range Arrows and High/Low End? 
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When you graph a function you graph it with either an explicit domain, that you have typed in, or an implied domain determined by the xaxis you have selected. How the graph is represented at the high and low end of this domain is determined by the settings of the Show High End and Show Low End Options for that function. FX Draw will determine if an open circle, closed circle or arrowhead should be shown and you choose if it will be shown.
Many functions will have values that lie outside the range of the axes within the domain selected, tan for example. At these values, FX Draw will add arrowheads to show that the graph continues beyond the range of the axes. These arrowheads are called out of range arrows.
