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`@@ -220,7 +220,14 @@`
`220`	`220`	`"where $a$ is the semi-major axis and $e$ is the eccentricity. The perihelion velocity is all in the $y$ direction and is:\n",`
`221`	`221`	`"$$v_y = v_p =\\sqrt{\\frac{GM_\\star}{a}\\frac{1+e}{1-e}}$$\n",`
`222`	`222`	`"\n",`
`223`		`-"We'll work in units of AU, years, and solar masses, in which case, $GM_\\star = 4\\pi^2$ (for the Sun). Here's a righthand side function for the ODEs:"`
	`223`	`+"We'll work in units of AU, years, and solar masses, in which case, $GM_\\star = 4\\pi^2$ (for the Sun).\n",`
	`224`	`+"\n",`
	`225`	`+"Your initial conditions should be:\n",`
	`226`	`+" * $x(t=0) = r_p$\n",`
	`227`	`+" * $y(t=0) = 0$\n",`
	`228`	`+" *\n",`
	`229`	`+"\n",`
	`230`	`+"Here's a righthand side function for the ODEs:"`
`224`	`231`	`]`
`225`	`232`	`},`
`226`	`233`	`{`

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