diff --git a/talk.md b/talk.md
index ab4d9b7..199dc8d 100644
--- a/talk.md
+++ b/talk.md
@@ -563,7 +563,7 @@ Mathematical grammar for a simultaneous fit with multiple disjoint _channels_ (o
 # HistFactory Template: implementation
 
 $$
-f\left(\mathrm{data}\middle|\mathrm{parameters}\right) =  f\left(\textcolor{#00a620}{\vec{n}}, \textcolor{#a3130f}{\vec{a}}\middle|\textcolor{#0495fc}{\vec{\eta}}, \textcolor{#9c2cfc}{\vec{\chi}}\right) = \prod\_{c \\,\in\\, \textrm{channels}} \prod\_{b \\,\in\\, \textrm{bins}\_c} \textrm{Pois} \left(\textcolor{#00a620}{n\_{cb}} \middle| \nu\_{cb}\left(\textcolor{#0495fc}{\vec{\eta}}, \textcolor{#9c2cfc}{\vec{\chi}}\right)\right) \\,\prod\_{\chi \\,\in\\, \vec{\chi}} c\_{\chi} \left(\textcolor{#a3130f}{a\_{\chi}}\middle|\textcolor{#9c2cfc}{\chi}\right)
+f\left(\mathrm{data}\middle|\mathrm{parameters}\right) =  f\left(\textcolor{#00a620}{\vec{n}}, \textcolor{#a3130f}{\vec{a}}\middle|\textcolor{#0495fc}{\vec{\eta}}, \textcolor{#9c2cfc}{\vec{\chi}}\right) = \prod\_{c \\,\in\\, \textrm{channels}} \prod\_{b \\,\in\\, \textrm{bins}\_c} \textrm{Pois} \left(\textcolor{#00a620}{n\_{cb}} \middle| \nu\_{cb}\left(\textcolor{#0495fc}{\vec{\eta}}, \textcolor{#9c2cfc}{\vec{\chi}}\right)\right) \prod\_{\chi \\,\in\\, \vec{\chi}} c\_{\chi} \left(\textcolor{#a3130f}{a\_{\chi}}\middle|\textcolor{#9c2cfc}{\chi}\right)
 $$
 
 .center[$\textcolor{#00a620}{\vec{n}}$: .obsdata[events], $\textcolor{#a3130f}{\vec{a}}$: .auxdata[auxiliary data], $\textcolor{#0495fc}{\vec{\eta}}$: .freepars[unconstrained pars], $\textcolor{#9c2cfc}{\vec{\chi}}$: .conpars[constrained pars]]