diff --git a/module3/exo3/co2_mlo_cumsum_1.png b/module3/exo3/co2_mlo_cumsum_1.png new file mode 100644 index 0000000000000000000000000000000000000000..f8dbf05e60785340ec65e0fa8fd8e4e0257c33e3 Binary files /dev/null and b/module3/exo3/co2_mlo_cumsum_1.png differ