diff --git a/notebooks/LST1_observation_simulator.ipynb b/notebooks/LST1_observation_simulator.ipynb
index 824d0bde1..919ab3748 100644
--- a/notebooks/LST1_observation_simulator.ipynb
+++ b/notebooks/LST1_observation_simulator.ipynb
@@ -19,7 +19,8 @@
     "from pyirf.statistics import li_ma_significance\n",
     "from scipy.stats import moyal, norm, skewnorm\n",
     "from pathlib import Path\n",
-    "from lstchain.io.io import get_resource_path"
+    "from lstchain.io.io import get_resource_path\n",
+    "from lstchain import version"
    ]
   },
   {
@@ -156,6 +157,8 @@
     "# For standard wobble offset (0.4 deg) reasonable values are alpha=0.333 (3 off regions) above 0.2 TeV, \n",
     "# and alpha=1 below 0.2 TeV.  For testing sensitivity with the standard definition, set alpha=0.2\n",
     "\n",
+    "# Note: this setting will be overriden in pulsar mode! (see below)\n",
+    "\n",
     "alpha = 0.333 # 1"
    ]
   },
@@ -176,12 +179,12 @@
    "outputs": [],
    "source": [
     "pulsar_mode = False # Set to True to activate it\n",
+    "on_phase_interval = 0.043 # Crab P1: [-0.017, 0.026]  Phase range for integrating the signal\n",
+    "off_phase_interval = 0.35 # [0.52 - 0.87]             Phase range for estimating the background\n",
     "\n",
-    "on_phase_interval = 0.043 # Crab P1: [-0.017, 0.026] \n",
-    "off_phase_interval = 0.35 # [0.52 - 0.87]\n",
-    "\n",
-    "alpha = on_phase_interval / off_phase_interval\n",
-    "print(f'alpha = {alpha:.4f}')\n",
+    "if pulsar_mode:\n",
+    "    alpha = on_phase_interval / off_phase_interval\n",
+    "    print(f'alpha = {alpha:.4f}')\n",
     "\n",
     "# The spectrum is interpreted as average flux in full period (i.e. not just in the on-phase)"
    ]
@@ -239,7 +242,6 @@
     "else:\n",
     "    print(f'Source angular radius within which {cut_efficiency:.1%} of the emission is contained: {source_radius}')\n",
     "\n",
-    "\n",
     "    background_increase_factor = (theta_cut**2 + \n",
     "                                  (source_radius.to_value(u.deg)*np.ones_like(theta_cut))**2) / (theta_cut**2)"
    ]
@@ -585,7 +587,9 @@
     "num_realizations_b = 100\n",
     "# Number of realizations (random numbers taken from skewnorm or moyal) for E-migration simulation\n",
     "\n",
-    "num_realizations = num_realizations_a * num_realizations_b"
+    "num_realizations = num_realizations_a * num_realizations_b\n",
+    "\n",
+    "np.random.seed(0)"
    ]
   },
   {
@@ -897,7 +901,7 @@
     "    SED_stat_error = SED*relative_stat_excess_error[displayed_points]\n",
     "    SED_total_error = SED*total_relative_excess_error[displayed_points]\n",
     "\n",
-    "    plt.figure(figsize=(10,6))\n",
+    "    fig = plt.figure(figsize=(10,6))\n",
     "    intrinsic_SED = (finebincenters*u.TeV)**2 * intrinsic_dFdE(finebincenters*u.TeV)\n",
     "\n",
     "    if redshift > 0:\n",
@@ -916,6 +920,26 @@
     "                 fmt='o', markersize=4, \n",
     "                 label='Observed, stat-only')\n",
     "\n",
+    "    ax = fig.axes[0]\n",
+    "    \n",
+    "    str = 'Source-independent analysis'\n",
+    "    str += f'\\nZenith angle = {zenith[zd_bin]:.1f} degrees'\n",
+    "    str += f'\\nCut efficiencies: {cut_efficiency:.0%}, {cut_efficiency:.0%} ($\\\\theta$, g/h)'\n",
+    "    str += f'\\nEffective observation time = {effective_obs_time.to(u.h):.1f}'\n",
+    "    if pulsar_mode:\n",
+    "        str += '\\nPulsar mode'\n",
+    "    str += f'\\nOn/Off exposure ratio $\\\\alpha$={alpha:.3f}'\n",
+    "    if source_radius == 0:\n",
+    "        str += '\\nPoint-like source'\n",
+    "    else:\n",
+    "        str += f'\\nSource radius: {source_radius:.2f}$^\\\\circ$ ({cut_efficiency:.0%} containment)'\n",
+    "    str += f'\\n\\ncta-lstchain {version.version}'\n",
+    "    \n",
+    "    ax.text(0.05, 0.38, str, \n",
+    "            transform=ax.transAxes, fontsize=12, verticalalignment='top',\n",
+    "            bbox=dict(facecolor='white', alpha=0.8))\n",
+    "\n",
+    "    \n",
     "    plt.yscale('log')\n",
     "    plt.xscale('log')\n",
     "    plt.xlabel('Energy (TeV)', fontsize=14)\n",
@@ -924,38 +948,42 @@
     "             np.nanmax((SED+SED_total_error)).value*5)\n",
     "\n",
     "    plt.xlim(mean_etrue_vs_ereco[displayed_points][0]/3, mean_etrue_vs_ereco[displayed_points][-1]*3)\n",
+    "\n",
     "    plt.legend()\n",
     "    plt.grid()\n",
+    "    plt.show()\n",
+    "    \n",
     "    \n",
-    "    plt.figure(figsize=(10,2))\n",
+    "    plt.figure(figsize=(10,3))\n",
     "    if not pulsar_mode:\n",
     "        plt.scatter(mean_etrue_vs_ereco[displayed_points], SED_total_error/SED, \n",
-    "                    s=8, label=f'Observed, stat + backg syst ({backg_systematics_uncertainty:.1%})')\n",
+    "                    s=12, label=f'Observed, stat + backg syst ({backg_systematics_uncertainty:.1%})')\n",
     "    plt.scatter(mean_etrue_vs_ereco[displayed_points], SED_stat_error/SED, \n",
-    "                s=8, label='Observed, stat-only')\n",
+    "                s=12, label='Observed, stat-only')\n",
     "    plt.xscale('log')\n",
     "    plt.yscale('log')\n",
     "    plt.xlabel('Energy (TeV)', fontsize=14)\n",
     "    plt.ylabel('Relative SED \\n uncertainty', fontsize=14)\n",
     "    plt.grid()\n",
+    "    plt.legend()\n",
     "    plt.show()\n",
-    "    \n",
+    "        \n",
     "else:\n",
     "    print(\"Nothing to display. No valid flux points!\")"
    ]
   },
   {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "52",
+   "cell_type": "markdown",
+   "id": "c927ed19",
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "source": [
+    "### NOTE: in reality, other systematics from data-MC discrepancies (in Aeff, energy-dependent) may make the point-to point fluctuations larger than shown above. Systematic errors of around a few percent (independent in each bin) are to be expected.\n"
+   ]
   },
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "53",
+   "id": "f3089dde",
    "metadata": {},
    "outputs": [],
    "source": []