diff --git a/part3/2023-CoDaS-HEP-Lecture-3-Slides.pdf b/part3/2023-CoDaS-HEP-Lecture-3-Slides.pdf
new file mode 100644
index 0000000..3cdb5ae
Binary files /dev/null and b/part3/2023-CoDaS-HEP-Lecture-3-Slides.pdf differ