diff --git a/indica/models/diode_filters.py b/indica/models/diode_filters.py
index 860a610a..f42f5253 100644
--- a/indica/models/diode_filters.py
+++ b/indica/models/diode_filters.py
@@ -31,7 +31,7 @@ def __init__(
         filter_fwhm: float = 1,  # 1
         filter_type: str = "boxcar",
         etendue: float = 1.0,
-        calibration: float = 2.0e-5,
+        calibration: float = 1,
         instrument_method="get_diode_filters",
         channel_mask: slice = None,  # =slice(18, 28),
     ):
diff --git a/indica/readers/read_st40.py b/indica/readers/read_st40.py
index 34502099..8b6539b2 100644
--- a/indica/readers/read_st40.py
+++ b/indica/readers/read_st40.py
@@ -301,7 +301,7 @@ def plot_profile(
     def __call__(
         self,
         instruments: list = [],
-        revisions: list = None,
+        revisions: dict = None,
         map_raw: bool = False,
         tstart: float = None,
         tend: float = None,
@@ -317,7 +317,7 @@ def __call__(
         if len(instruments) == 0:
             instruments = INSTRUMENTS
         if revisions is None:
-            revisions = [0] * len(instruments)
+            revisions = {instrument: 0 for instrument in instruments}
         if tstart is None:
             tstart = self.tstart
         if tend is None:
diff --git a/indica/readers/st40reader.py b/indica/readers/st40reader.py
index 1776a0eb..dc92d5ad 100644
--- a/indica/readers/st40reader.py
+++ b/indica/readers/st40reader.py
@@ -702,11 +702,14 @@ def _get_helike_spectroscopy(
             direction = np.array([direction])
 
         results["times"], _ = self._get_signal(uid, instrument, ":time", revision)
-        results["wavelength"], _ = self._get_signal(
-            uid, instrument, ":wavelength", revision
-        )
+        wavelength, _ = self._get_signal(uid, instrument, ":wavelength", revision)
         # TODO: change once wavelength in MDS+ has been fixed to nanometers!
-        results["wavelength"] /= 10.0
+        wavelength /= 10.0
+        if self.pulse >= 10307:
+            dlambda = float(np.abs(wavelength[1] - wavelength[0])) * 4
+            wavelength += dlambda
+        results["wavelength"] = wavelength
+
         for q in quantities:
             qval, q_path = self._get_signal(
                 uid, instrument, self.QUANTITIES_MDS[instrument][q], revision