diff --git a/src/nmreval/data/points.py b/src/nmreval/data/points.py
index 35d8403..3282627 100644
--- a/src/nmreval/data/points.py
+++ b/src/nmreval/data/points.py
@@ -648,19 +648,19 @@ class Points:
 
         header = []
         for k, v in self.meta.items():
-            header.append('%s: %s' % (k, str(v)))
+            header.append(f'{k}: {v}')
         header = '\n'.join(header)
 
         if np.all(self.mask):
-            np.savetxt(path, self.toarray(err=err), header=header, fmt='%.10f')
+            np.savetxt(path, self.toarray(err=err), header=header, fmt='%.10e')
         else:
             with path.open('w') as f:
                 f.write(header)
                 for i, l in enumerate(self.toarray(err=err)):
                     if self.mask[i]:
-                        f.write('\t'.join(map(str, l.tolist())) + '\n')
+                        f.write('\t'.join(map(lambda _x: f'{_x:.10e}', l.tolist())) + '\n')
                     else:
-                        f.write('#' + '\t'.join(map(str, l.tolist())) + '\n')
+                        f.write('#' + '\t'.join(map(lambda _x: f'{_x:.10e}', l.tolist())) + '\n')
 
     def get_state(self) -> dict:
         ret_dic = {'x': self._x.tolist(),