diff --git a/mydata_classes.py b/mydata_classes.py
new file mode 100644
index 0000000..38606ec
--- /dev/null
+++ b/mydata_classes.py
@@ -0,0 +1,14 @@
+class Grid(object):
+    def __init__(self, lon, lat, z, time, Nlon, Nlat, Nz, Nt, Ulon, Ulat, Uz, Ut):
+        self.lon  = lon
+        self.lat  = lat
+        self.z    = z
+        self.time = time
+        self.Nlon = Nlon
+        self.Nlat = Nlat
+        self.Nz   = Nz
+        self.Nt   = Nt
+        self.Ulon = Ulon
+        self.Ulat = Ulat
+        self.Uz   = Uz
+        self.Ut   = Ut