corr use of close_enough

pub/src/plot.cpp

@@ -344,7 +344,7 @@ void NPlot::Plot( class CPlot *plot, bool add )
                             double yi = ( (xn[i+1]-xn[i])*yn[i-1] +
                                           (xn[i]-xn[i-1])*yn[i+1] ) /
                                 (xn[i+1]-xn[i-1]);
-                            if ( plot->Y.close_enough( yn[i], yi, 0.005 ) ) {
+                            if ( !plot->Y.close_enough( yn[i], yi, 0.005 ) ) {
                                 xc.push_back( (xn[i-1] + xn[i])/2 );
                                 //cout << "DEB disc " << xc.back() << "\n";
                                 insert_next = true;