diff --git a/src/hisp/plamsa_data_handling/main.py b/src/hisp/plamsa_data_handling/main.py
index 6621227..e766e4e 100644
--- a/src/hisp/plamsa_data_handling/main.py
+++ b/src/hisp/plamsa_data_handling/main.py
@@ -232,7 +232,8 @@ def get_heat(self, pulse: Pulse, bin: SubBin | DivBin, t_rel: float) -> float:
                 heat_val = heat_total
         elif pulse.pulse_type == "RISP":
             if isinstance(bin, SubBin):
-                heat_total = data["heat_total"]+0.11e+06 # photon radiation heat adjustment
+                photon_radiation_heat = 0.11e6  # W/m2
+                heat_total = data["heat_total"]+photon_radiation_heat 
                 heat_ion = data["heat_ion"]
                 heat_val = heat_total - heat_ion * (1 - bin.wetted_frac)
             else: