diff --git a/miex_app.py b/miex_app.py
index 5986e80..923247c 100644
--- a/miex_app.py
+++ b/miex_app.py
@@ -5,11 +5,6 @@
 import streamlit as st
 
 
-def conv(line):
-    # Converter for lambda/n/k database files
-    return line.replace(b"D", b"e")
-
-
 st.set_page_config(page_title="MIEX", page_icon=None)
 st.title("MIEX App")
 st.write("This app is a Mie scattering code for large grains written in Python and based on [MIEX](https://ui.adsabs.harvard.edu/abs/2018ascl.soft10019W) by [Wolf & Voshchinnikov (2004)](https://ui.adsabs.harvard.edu/abs/2004CoPhC.162..113W).")
@@ -175,7 +170,7 @@ def conv(line):
         format="%d",
         step=2,
         min_value=1,
-        disabled=not doSA,
+        disabled=(not doSA),
     )
 
 st.divider()
@@ -236,9 +231,8 @@ def conv(line):
             if fnames[icomp] is None:
                 st.error("Error: Dust data file missing!")
                 st.stop()
-            w, n, k = np.loadtxt(
-                fnames[icomp], unpack=True, comments="#", converters=conv
-            )
+
+            w, n, k = np.loadtxt(fnames[icomp], comments="#", unpack=True)
 
             if isinstance(w, float):
                 if nlam == 1:
diff --git a/miex_notebook_2.ipynb b/miex_notebook_2.ipynb
index ee2f645..f27ca72 100644
--- a/miex_notebook_2.ipynb
+++ b/miex_notebook_2.ipynb
@@ -17,12 +17,7 @@
     "# import packages and define functions\n",
     "import miex.miex as miex\n",
     "import numpy as np\n",
-    "import matplotlib.pyplot as plt\n",
-    "\n",
-    "\n",
-    "def conv(line):\n",
-    "    # converter for lambda/n/k database files\n",
-    "    return line.replace(b\"D\", b\"e\")"
+    "import matplotlib.pyplot as plt"
    ]
   },
   {
@@ -45,7 +40,7 @@
     "\n",
     "# OR use a dust data file (three columns: wavelength/micron real imag)\n",
     "filename = \"ri-data/silicate\"\n",
-    "wavelength, ri_real, ri_imag = np.loadtxt(filename, unpack=True, comments=\"#\", converters=conv)\n",
+    "wavelength, ri_real, ri_imag = np.loadtxt(filename, unpack=True, comments=\"#\")\n",
     "\n",
     "nlam = len(wavelength)"
    ]
diff --git a/run_miex.py b/run_miex.py
index 776a13a..b545b01 100644
--- a/run_miex.py
+++ b/run_miex.py
@@ -45,11 +45,6 @@
 # ====================================================================================================
 
 
-def conv(line):
-    # Converter for lambda/n/k database files
-    return line.replace(b"D", b"e")
-
-
 def main(input_filename):
     # ---------------------------------------------------------------------------------------------------
     # 0. General settings
@@ -169,7 +164,6 @@ def main(input_filename):
             "ri-data/" + fnames[icomp],
             comments="#",
             unpack=True,
-            converters=conv,
         )
         if icomp > 0 and not np.array_equal(wavelength, w[:nlam]):
             raise Exception("Wavelength distribution in dust data files do not match.")