diff --git a/diffsky/diagnostics/plot_delta_mag_burstiness.py b/diffsky/diagnostics/plot_delta_mag_burstiness.py
index 18492b4..c7c6b27 100644
--- a/diffsky/diagnostics/plot_delta_mag_burstiness.py
+++ b/diffsky/diagnostics/plot_delta_mag_burstiness.py
@@ -12,7 +12,10 @@
 from dsps.cosmology import DEFAULT_COSMOLOGY
 from dsps.cosmology.flat_wcdm import _age_at_z_kern, age_at_z0
 from dsps.data_loaders import load_filter_data, load_ssp_templates
-from dsps.data_loaders.retrieve_fake_fsps_data import load_fake_ssp_data
+from dsps.data_loaders.retrieve_fake_fsps_data import (
+    load_fake_filter_transmission_curves,
+    load_fake_ssp_data,
+)
 from dsps.dust.utils import get_filter_effective_wavelength
 from dsps.photometry import photpop
 from dsps.utils import cumulative_mstar_formed
@@ -46,13 +49,35 @@
 mpurple, mgreen, morange = ("#9467bd", "#2ca02c", "#ff7f0e")
 
 
-def get_interpolated_lsst_tcurves(ssp_wave):
-    tcurve_u = load_filter_data.load_transmission_curve(bn_pat="lsst_u*")
-    tcurve_g = load_filter_data.load_transmission_curve(bn_pat="lsst_g*")
-    tcurve_r = load_filter_data.load_transmission_curve(bn_pat="lsst_r*")
-    tcurve_i = load_filter_data.load_transmission_curve(bn_pat="lsst_i*")
-    tcurve_z = load_filter_data.load_transmission_curve(bn_pat="lsst_z*")
-    tcurve_y = load_filter_data.load_transmission_curve(bn_pat="lsst_y*")
+def get_interpolated_lsst_tcurves(ssp_wave, drn_ssp_data=DEFAULT_DSPS_DRN):
+    try:
+        tcurve_u = load_filter_data.load_transmission_curve(
+            bn_pat="lsst_u*", drn=drn_ssp_data
+        )
+        tcurve_g = load_filter_data.load_transmission_curve(
+            bn_pat="lsst_g*", drn=drn_ssp_data
+        )
+        tcurve_r = load_filter_data.load_transmission_curve(
+            bn_pat="lsst_r*", drn=drn_ssp_data
+        )
+        tcurve_i = load_filter_data.load_transmission_curve(
+            bn_pat="lsst_i*", drn=drn_ssp_data
+        )
+        tcurve_z = load_filter_data.load_transmission_curve(
+            bn_pat="lsst_z*", drn=drn_ssp_data
+        )
+        tcurve_y = load_filter_data.load_transmission_curve(
+            bn_pat="lsst_y*", drn=drn_ssp_data
+        )
+    except (ImportError, OSError, ValueError):
+        _res = load_fake_filter_transmission_curves()
+        wave, u, g, r, i, z, y = _res
+        tcurve_u = load_filter_data.TransmissionCurve((wave, u))
+        tcurve_g = load_filter_data.TransmissionCurve((wave, g))
+        tcurve_r = load_filter_data.TransmissionCurve((wave, r))
+        tcurve_i = load_filter_data.TransmissionCurve((wave, i))
+        tcurve_z = load_filter_data.TransmissionCurve((wave, z))
+        tcurve_y = load_filter_data.TransmissionCurve((wave, y))
 
     tcurve_u = tcurve_u._replace(
         transmission=np.interp(ssp_wave, tcurve_u.wave, tcurve_u.transmission)
@@ -105,7 +130,9 @@ def get_burstiness_delta_mag_quantities(
         ssp_data = load_fake_ssp_data()
         print(f"{drn_ssp_data} directory not found. Using fake SSP SEDs")
 
-    lsst_tcurves = get_interpolated_lsst_tcurves(ssp_data.ssp_wave)
+    lsst_tcurves = get_interpolated_lsst_tcurves(
+        ssp_data.ssp_wave, drn_ssp_data=drn_ssp_data
+    )
     wave_eff_arr = get_wave_eff(lsst_tcurves, z_obs)
 
     X = np.array([ssp_data.ssp_wave] * 6)
@@ -204,11 +231,13 @@ def get_burstiness_delta_mag_quantities(
     return mags, alt_mags, halopop, sfh_galpop, smh_galpop, mc_is_q
 
 
-def plot_delta_mag_lsst_vs_logsm(z_obs, n_halos=2_000):
+def plot_delta_mag_lsst_vs_logsm(z_obs, n_halos=2_000, drn_ssp_data=DEFAULT_DSPS_DRN):
     if not HAS_MATPLOTLIB:
         raise ImportError("Must have matplotlib installed to use this function")
 
-    _res = get_burstiness_delta_mag_quantities(z_obs, n_halos=n_halos)
+    _res = get_burstiness_delta_mag_quantities(
+        z_obs, n_halos=n_halos, drn_ssp_data=drn_ssp_data
+    )
     mags, alt_mags, halopop, sfh_galpop, smh_galpop, mc_is_q = _res
 
     fig, ax = plt.subplots(1, 1)
@@ -252,12 +281,17 @@ def plot_delta_mag_lsst_vs_logsm(z_obs, n_halos=2_000):
 
 
 def plot_delta_mag_lsst_vs_ssfr(
-    z_obs, figname="delta_mag_burstiness_ssfr.png", n_halos=2_000
+    z_obs,
+    figname="delta_mag_burstiness_ssfr.png",
+    n_halos=2_000,
+    drn_ssp_data=DEFAULT_DSPS_DRN,
 ):
     if not HAS_MATPLOTLIB:
         raise ImportError("Must have matplotlib installed to use this function")
 
-    _res = get_burstiness_delta_mag_quantities(z_obs, n_halos=n_halos)
+    _res = get_burstiness_delta_mag_quantities(
+        z_obs, n_halos=n_halos, drn_ssp_data=drn_ssp_data
+    )
     mags, alt_mags, halopop, sfh_galpop, smh_galpop, mc_is_q = _res
 
     ssfr_z0 = np.log10(sfh_galpop[:, -1]) - np.log10(smh_galpop[:, -1])