diff --git a/src/graphics/graphics.c b/src/graphics/graphics.c
index 7b626f4..6be89ca 100644
--- a/src/graphics/graphics.c
+++ b/src/graphics/graphics.c
@@ -47,6 +47,11 @@ static volatile int buffer_lines_size = 0;
 static volatile int buffer_colors_size = 0;
 static volatile int buffer_plans_size = 0;
 
+static volatile int buffer_vertex_0_arrow = 0;
+static volatile int buffer_lines_0_arrow = 0;
+static volatile int buffer_colors_0_arrow = 0;
+static volatile int buffer_plans_0_arrow = 0;
+
 #define TEST 0
 
 /*
@@ -605,19 +610,28 @@ static inline int erase_arrow (int arrows_nb, int address, int site, int x, int
 {
     arrows_nb --;
 
-    if (1)
-    {
-        arrows_ptr[address].load = arrows_ptr[arrows_nb].load;
-        arrows_ptr[address].site = arrows_ptr[arrows_nb].site;
-        arrows_ptr[address].x = arrows_ptr[arrows_nb].x;
-        arrows_ptr[address].y = arrows_ptr[arrows_nb].y;
-        arrows_ptr[address].z = arrows_ptr[arrows_nb].z;
-    }
+    arrows_ptr[address].load = arrows_ptr[arrows_nb].load;
+    arrows_ptr[address].site = arrows_ptr[arrows_nb].site;
+    arrows_ptr[address].x = arrows_ptr[arrows_nb].x;
+    arrows_ptr[address].y = arrows_ptr[arrows_nb].y;
+    arrows_ptr[address].z = arrows_ptr[arrows_nb].z;
+
 
     if (arrows_nb > 0) {
-        void *newptr = g_realloc(arrows_ptr, arrows_nb * sizeof(struct arrow_t));
-        if (newptr) arrows_ptr = newptr;
-        else        perror("In erase arrow, can't re_allocate for arrow list.\n");
+
+        void *new_arrows_list_ptr = g_realloc(arrows_ptr, arrows_nb * sizeof(struct arrow_t));
+        if (new_arrows_list_ptr) arrows_ptr = new_arrows_list_ptr;
+        else                     perror("In erase arrow, can't re_allocate for arrow list.\n");
+
+        printf("buffer_vertex_0_arrow = %d   arrows_nb * 3 = %d     <<<<\n", buffer_vertex_0_arrow, arrows_nb * 3);
+        void *new_arrows_vertex_ptr = g_realloc(buffer_vertex_origin, buffer_vertex_0_arrow + 9 * 3 * sizeof(GLfloat));
+        if (new_arrows_vertex_ptr) buffer_vertex_origin = new_arrows_vertex_ptr;
+        else                       perror("In erase arrow, can't re_allocate for arrow vertex buffer.\n");
+
+        printf("buffer_lines_0_arrow = %d   arrows_nb * 2 = %d     <<<<\n", buffer_lines_0_arrow, arrows_nb * 2);
+        void *new_arrows_lines_ptr = g_realloc(buffer_lines_origin, buffer_lines_0_arrow + 9 * 2 * sizeof(GLfloat));
+        if (new_arrows_lines_ptr) buffer_lines_origin = new_arrows_lines_ptr;
+        else                       perror("In erase arrow, can't re_allocate for arrow lines buffer.\n");
     }
 
     print_arrows_array (arrows_ptr, arrows_nb,0);
@@ -774,6 +788,15 @@ void  __attribute__((optimize("no-unroll-loops"))) main_test_graphics (void)
     write_grids_on_space_faces_lines (buffer_lines_size, space_X, space_Y, space_Z);
     if (0) printf("buffer_lines_size  after writing (n) space_faces_lines : %d (* 2 = %d)\n\n", buffer_lines_size / 2, buffer_lines_size);
 
+    /*  Ce programme définit et crée séquentiellement les caractéristiques puis les images de l'espace puis celles des flèches
+     *  Pour pouvoir effacer une flèche (n'importe laquelle),
+     *       il est nécéssaire de connaître la taille des buffers au moment de la création de la première flèche */
+
+    buffer_vertex_0_arrow = buffer_vertex_size;
+    buffer_lines_0_arrow = buffer_lines_size;
+    printf("buffer_vertex_0_arrow = %d (%d points)    buffer_lines_0_arrow = %d (%d lines)\n",\
+           buffer_vertex_0_arrow, buffer_vertex_0_arrow / 3, buffer_lines_0_arrow, buffer_lines_0_arrow / 2);
+
     /*  A R R O W S  */
 
 /* #pragma omp parallel */