fixed fmt error (#302)

include/aare/Interpolator.hpp

@@ -171,11 +171,14 @@ Coordinate2D Interpolator::transform_eta_values(const Eta2<T> &eta) const {
 
     if (static_cast<ssize_t>(ix) >= m_etabinsx.size() - 1 ||
         static_cast<ssize_t>(iy) >= m_etabinsy.size() - 1 ||
-        static_cast<ssize_t>(ie) >= m_energy_bins.size() - 1)
-        throw std::runtime_error(
-            fmt::format("Eta values out of bounds of eta distribution: eta.x = "
-                        "{:.4f}, eta.y = {:.4f}, energy = {:.4f}",
-                        eta.x, eta.y, eta.sum));
+        static_cast<ssize_t>(ie) >= m_energy_bins.size() - 1) {
+        throw std::runtime_error(fmt::format(
+            "Eta values (eta.x = {:4f}, eta.y = {:4f}, energy = {}) out of "
+            "bounds of eta distribution with largest values: (eta.x = {:4f}, "
+            "eta.y = {:4f}, energy = {:4f})",
+            eta.x, eta.y, eta.sum, *(m_etabinsx.end() - 1),
+            *(m_etabinsy.end() - 1), *(m_energy_bins.end() - 1)));
+    }
 
     // TODO: bilinear interpolation only works if all bins have a size > 1 -
     // otherwise bilinear interpolation with zero values which skew the