diff --git a/exercise/add/ex06/transientProcess_synMach.ipynb b/exercise/add/ex06/transientProcess_synMach.ipynb
index 9e100a7..e1e7654 100644
--- a/exercise/add/ex06/transientProcess_synMach.ipynb
+++ b/exercise/add/ex06/transientProcess_synMach.ipynb
@@ -12,7 +12,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": 1,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -37,7 +37,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": 2,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -60,7 +60,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": 3,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -86,7 +86,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 15,
+   "execution_count": 4,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -137,7 +137,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 16,
+   "execution_count": 8,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -157,7 +157,7 @@
     "i_q = x[:,1]\n",
     "i_f = x[:,2]\n",
     "omega = x[:,3]\n",
-    "angle = x[:,3]\n",
+    "angle = x[:,4]\n",
     "\n",
     "# torque\n",
     "T = 3/2*p*(M_fs*i_f*i_q + (L_d-L_q)*i_q*i_d)"
@@ -173,7 +173,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 17,
+   "execution_count": 9,
    "metadata": {},
    "outputs": [
     {
@@ -202,7 +202,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 18,
+   "execution_count": 10,
    "metadata": {},
    "outputs": [
     {