diff --git a/src/main.rs b/src/main.rs
index 1d7881b..55c7232 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2,11 +2,11 @@ use image::{ImageBuffer, Rgba, RgbaImage};
 use std::f64::consts::PI;
 use std::fs;
 
-fn chladni(x: f64, y: f64, n: f64, m: f64) -> f64 {
+fn chladni(x: f64, y: f64, n: f64, m: f64, eps: f64) -> f64 {
     (n * PI * x).cos() * (m * PI * y).cos() - (m * PI * x).cos() * (n * PI * y).cos()
 }
 
-fn generate_png(n: u32, m: u32, width: u32, height: u32) {
+fn generate_png(n: u32, m: u32, width: u32, height: u32, eps: f64) {
     let mut img: RgbaImage = ImageBuffer::new(width, height);
 
     for (x, y, pixel) in img.enumerate_pixels_mut() {
@@ -14,7 +14,7 @@ fn generate_png(n: u32, m: u32, width: u32, height: u32) {
         let xf = (x as f64 / width as f64) * 2.0 - 1.0;
         let yf = (y as f64 / height as f64) * 2.0 - 1.0;
 
-        let val = chladni(xf, yf, n as f64, m as f64);
+        let val = chladni(xf, yf, n as f64, m as f64, eps);
         let intensity = val.abs();
 
         let bright = (((0.08 - intensity).max(0.0) / 0.08) * 255.0) as u8;
@@ -22,7 +22,7 @@ fn generate_png(n: u32, m: u32, width: u32, height: u32) {
         // *pixel = Rgb([brigh, brigh, brigh]);
     }
 
-    let filename = format!("out/chladni_{}_{}.png", n, m);
+    let filename = format!("out/chladni_{}_{}_{}.png", n, m, eps);
     img.save(&filename).unwrap();
     println!("{}", filename);
 }
@@ -30,14 +30,15 @@ fn generate_png(n: u32, m: u32, width: u32, height: u32) {
 fn main() {
     let width = 1000;
     let height = 1000;
-    let max_n = 6;
-    let max_m = 6;
+    let max_n = 5;
+    let max_m = 5;
 
     fs::create_dir_all("out").expect("Erreur");
 
     for n in 1..max_n {
         for m in 1..max_m {
-            generate_png(n, m, width, height);
+            generate_png(n, m, width, height, -1.0);
+            generate_png(n, m, width, height, 1.0);
         }
     }
 }