@gartung Patrick, this would mean changing the code in .h to 
```
const double invPtErrorScale;
const double phiErrorScale;
...
```
and then in the .cc
```
L1MuonPixelTrackFitter::L1MuonPixelTrackFitter(const edm::ParameterSet& cfg)
  : theConfig(cfg),
invPtErrorScale{theConfig.getParameter<double>("invPtErrorScale")},
phiErrorScale{theConfig.getParameter<double>("phiErrorScale")},
cotThetaErrorScale{theConfig.getParameter<double>("cotThetaErrorScale")},
tipErrorScale{theConfig.getParameter<double>("tipErrorScale")},
zipErrorScale{theConfig.getParameter<double>("zipErrorScale")}
{ }
```