diff --git a/openTEPES/openTEPES_InputData.py b/openTEPES/openTEPES_InputData.py
index 81fc9a61..6789e132 100644
--- a/openTEPES/openTEPES_InputData.py
+++ b/openTEPES/openTEPES_InputData.py
@@ -567,8 +567,8 @@ def ProcessParameter(pDataFrame: pd.DataFrame, pTimeStep: int) -> pd.DataFrame:
     mTEPES.la     = Set(doc='all real        electric lines'   , initialize=[ln     for ln   in mTEPES.ln if pLineX              [ln] != 0.0 and pLineNTCFrw[ln] > 0.0 and pLineNTCBck[ln] > 0.0 and pElecNetPeriodIni[ln]  <= mTEPES.p.last() and pElecNetPeriodFin[ln]  >= mTEPES.p.first()])
     mTEPES.ls     = Set(doc='all real switch electric lines'   , initialize=[la     for la   in mTEPES.la if pIndBinLineSwitch   [la]       ])
     mTEPES.lc     = Set(doc='candidate       electric lines'   , initialize=[la     for la   in mTEPES.la if pNetFixedCost       [la] >  0.0])
-    mTEPES.cd     = Set(doc='             DC electric lines'   , initialize=[la     for la   in mTEPES.la if pNetFixedCost       [la] >  0.0 and pLineType[la] == 'DC'])
-    mTEPES.ed     = Set(doc='             DC electric lines'   , initialize=[la     for la   in mTEPES.la if pNetFixedCost       [la] == 0.0 and pLineType[la] == 'DC'])
+    mTEPES.cd     = Set(doc='candidate    DC electric lines'   , initialize=[la     for la   in mTEPES.la if pNetFixedCost       [la] >  0.0 and pLineType[la] == 'DC'])
+    mTEPES.ed     = Set(doc='existing     DC electric lines'   , initialize=[la     for la   in mTEPES.la if pNetFixedCost       [la] == 0.0 and pLineType[la] == 'DC'])
     mTEPES.ll     = Set(doc='loss            electric lines'   , initialize=[la     for la   in mTEPES.la if pLineLossFactor     [la] >  0.0 and pIndBinNetLosses > 0 ])
     mTEPES.rf     = Set(doc='reference node'                   , initialize=[pReferenceNode])
     mTEPES.gq     = Set(doc='gen    reactive units'            , initialize=[gg     for gg   in mTEPES.gg if pRMaxReactivePower  [gg] >  0.0 and                                                     pElecGenPeriodIni[gg]  <= mTEPES.p.last() and pElecGenPeriodFin[gg]  >= mTEPES.p.first()])