diff --git a/pes_to_spec/test/prepare_plots.py b/pes_to_spec/test/prepare_plots.py
index 25deba466113a1a5d604d4cec202e85dcb91559d..f103df5a1405045f8311682c203e48b4859bc63e 100755
--- a/pes_to_spec/test/prepare_plots.py
+++ b/pes_to_spec/test/prepare_plots.py
@@ -56,8 +56,8 @@ def plot_autocov(df: pd.DataFrame, filename: str):
     ax = fig.add_subplot(gs[0, 0])
     fwhm_hr = df.fwhm_hr[0]
     fwhm_virt = df.fwhm_virt[0]
-    ax.plot(df.energy, df.auto_corr_hr, c='b', lw=3, label="Grating spectrometer (FWHM={fwhm_hr:.2} eV)")
-    ax.plot(df.energy, df.auto_corr_virt, c='r', lw=3, label="Virtual spectrometer (FWHM={fwhm_cirt:.2} eV)")
+    ax.plot(df.energy, df.auto_corr_hr, c='b', lw=3, label="FEL + Grating spec. (FWHM={fwhm_hr:.2} eV)")
+    ax.plot(df.energy, df.auto_corr_virt, c='r', lw=3, label="FEL + Virtual spec. (FWHM={fwhm_cirt:.2} eV)")
     ax.legend(frameon=False, borderaxespad=0, loc='upper left')
     ax.spines['top'].set_visible(False)
     ax.spines['right'].set_visible(False)