diff --git a/dsps/sed/stellar_age_weights.py b/dsps/sed/stellar_age_weights.py
index ea4607a..a0fcdee 100644
--- a/dsps/sed/stellar_age_weights.py
+++ b/dsps/sed/stellar_age_weights.py
@@ -1,9 +1,10 @@
 """Kernels calculating stellar age PDF-weighting of SSP tempates"""
-from jax import numpy as jnp
 from jax import jit as jjit
-from ..utils import _jax_get_dt_array
-from ..constants import SFR_MIN, T_BIRTH_MIN, N_T_LGSM_INTEGRATION
+from jax import numpy as jnp
+
+from ..constants import N_T_LGSM_INTEGRATION, SFR_MIN, T_BIRTH_MIN
 from ..cosmology import TODAY
+from ..utils import _jax_get_dt_array, cumulative_mstar_formed
 
 __all__ = ("calc_age_weights_from_sfh_table",)
 
@@ -170,9 +171,7 @@ def _calc_logsm_table_from_sfh_table(gal_t_table, gal_sfr_table, sfr_min):
         Minimum star formation rate in Msun/yr
 
     """
-    dt_table = _jax_get_dt_array(gal_t_table)
-
     gal_sfr_table = jnp.where(gal_sfr_table < sfr_min, sfr_min, gal_sfr_table)
-    gal_mstar_table = jnp.cumsum(gal_sfr_table * dt_table) * 1e9
-    logsm_table = jnp.log10(gal_mstar_table)
+    gal_smh_table = cumulative_mstar_formed(gal_t_table, gal_sfr_table)
+    logsm_table = jnp.log10(gal_smh_table)
     return logsm_table
diff --git a/dsps/sed/tests/test_csp_sed.py b/dsps/sed/tests/test_csp_sed.py
index 14717e0..597af82 100644
--- a/dsps/sed/tests/test_csp_sed.py
+++ b/dsps/sed/tests/test_csp_sed.py
@@ -2,10 +2,12 @@
 """
 import numpy as np
 from jax import random as jran
-from ..stellar_sed import calc_rest_sed_sfh_table_lognormal_mdf
-from ..stellar_sed import calc_rest_sed_sfh_table_met_table
-from ...constants import T_BIRTH_MIN
 
+from ...constants import T_TABLE_MIN
+from ..stellar_sed import (
+    calc_rest_sed_sfh_table_lognormal_mdf,
+    calc_rest_sed_sfh_table_met_table,
+)
 
 SEED = 43
 FSPS_LG_AGES = np.arange(5.5, 10.2, 0.05)  # log10 ages in years
@@ -15,7 +17,7 @@ def test_calc_rest_sed_lognormal_mdf():
     ran_key = jran.PRNGKey(SEED)
     t_obs = 13.0
     n_t = 500
-    gal_t_table = np.linspace(T_BIRTH_MIN, t_obs, n_t)
+    gal_t_table = np.linspace(T_TABLE_MIN, t_obs, n_t)
 
     sfr_key, met_key, sed_key = jran.split(ran_key, 3)
     gal_sfr_table = jran.uniform(sfr_key, minval=0, maxval=10, shape=(n_t,))
@@ -63,7 +65,7 @@ def test_calc_rest_sed_lgmet_table():
     ran_key = jran.PRNGKey(SEED)
     t_obs = 13.0
     n_t = 500
-    gal_t_table = np.linspace(T_BIRTH_MIN, t_obs, n_t)
+    gal_t_table = np.linspace(T_TABLE_MIN, t_obs, n_t)
 
     sfr_key, met_key, sed_key = jran.split(ran_key, 3)
     gal_sfr_table = jran.uniform(sfr_key, minval=0, maxval=10, shape=(n_t,))
diff --git a/dsps/sed/tests/test_ssp_weights.py b/dsps/sed/tests/test_ssp_weights.py
index 8e48f9e..d8f31ee 100644
--- a/dsps/sed/tests/test_ssp_weights.py
+++ b/dsps/sed/tests/test_ssp_weights.py
@@ -2,10 +2,12 @@
 """
 import numpy as np
 from jax import random as jran
-from ..ssp_weights import calc_ssp_weights_sfh_table_lognormal_mdf
-from ..ssp_weights import calc_ssp_weights_sfh_table_met_table
-from ...constants import T_BIRTH_MIN
 
+from ...constants import T_TABLE_MIN
+from ..ssp_weights import (
+    calc_ssp_weights_sfh_table_lognormal_mdf,
+    calc_ssp_weights_sfh_table_met_table,
+)
 
 SEED = 43
 FSPS_LG_AGES = np.arange(5.5, 10.2, 0.05)  # log10 ages in years
@@ -15,7 +17,7 @@ def test_calc_ssp_weights_lognormal_mdf():
     ran_key = jran.PRNGKey(SEED)
     t_obs = 13.0
     n_t = 500
-    gal_t_table = np.linspace(T_BIRTH_MIN, t_obs, n_t)
+    gal_t_table = np.linspace(T_TABLE_MIN, t_obs, n_t)
 
     sfr_key, met_key = jran.split(ran_key, 2)
     gal_sfr_table = jran.uniform(sfr_key, minval=0, maxval=10, shape=(n_t,))
@@ -59,7 +61,7 @@ def test_calc_ssp_weights_met_table():
     ran_key = jran.PRNGKey(SEED)
     t_obs = 13.0
     n_t = 500
-    gal_t_table = np.linspace(T_BIRTH_MIN, t_obs, n_t)
+    gal_t_table = np.linspace(T_TABLE_MIN, t_obs, n_t)
 
     sfr_key, met_key = jran.split(ran_key, 2)
     gal_sfr_table = jran.uniform(sfr_key, minval=0, maxval=10, shape=(n_t,))