diff --git a/.prettierignore b/.prettierignore
new file mode 100644
index 0000000..fa65608
--- /dev/null
+++ b/.prettierignore
@@ -0,0 +1 @@
+*.ipynb
diff --git a/docs/gluex-amplitude.ipynb b/docs/gluex-amplitude.ipynb
index bd234ae..96e228f 100644
--- a/docs/gluex-amplitude.ipynb
+++ b/docs/gluex-amplitude.ipynb
@@ -4,7 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# GlueX amplitude model with SymPy"
+    "# Symbolic amplitude model"
    ]
   },
   {
@@ -208,10 +208,10 @@
     "\n",
     "\n",
     "def create_range(__min, __max) -> tuple[sp.Rational, ...]:\n",
-    "    return tuple(sp.Rational(x) for x in arange(__min, __max))\n",
+    "    return tuple(sp.Rational(x) for x in arange(__min, __max + 1))\n",
     "\n",
     "\n",
-    "max_l = 1\n",
+    "max_l = 0\n",
     "l_range = create_range(0, max_l)\n",
     "m_range = create_range(-max_l, max_l)\n",
     "lp = sp.IndexedBase(\"[l]^{(+)}\", complex=True)\n",
@@ -228,7 +228,7 @@
     "        * (PoolSum(lp[m, k] * sp.re(znm), (l, l_range), (m, m_range))) ** 2\n",
     "        + (1 + Py)\n",
     "        * (PoolSum(lm[m, k] * sp.im(znm), (l, l_range), (m, m_range))) ** 2,\n",
-    "        (k, [-1, +1]),\n",
+    "        (k, [0]),\n",
     "    )\n",
     ")\n",
     "intensity_expr"