Datafield: access to error sigmas

Device/Data/Datafield.cpp

@@ -75,6 +75,16 @@ double Datafield::valAt(size_t i) const
     return m_values[i];
 }
 
+bool Datafield::hasErrorSigmas()
+{
+    return m_errSigmas.size()>0;
+}
+
+double Datafield::errorSigmaAt(size_t i) const
+{
+    return m_errSigmas[i];
+}
+
 void Datafield::setAllTo(const double& value)
 {
     for (double& v : m_values)

Device/Data/Datafield.h

@@ -50,9 +50,11 @@ public:
     Datafield* clone() const;
 
     void setAt(size_t i, double val);
-
     double valAt(size_t i) const;
 
+    bool hasErrorSigmas();
+    double errorSigmaAt(size_t i) const;
+
     // retrieve basic info
 
     const Frame& frame() const;