diff --git a/pytomoatt/_version.py b/pytomoatt/_version.py
index aa62704..d0ba488 100644
--- a/pytomoatt/_version.py
+++ b/pytomoatt/_version.py
@@ -1 +1 @@
-__version__ = '0.2.4'
\ No newline at end of file
+__version__ = '0.2.5'
\ No newline at end of file
diff --git a/pytomoatt/checkerboard.py b/pytomoatt/checkerboard.py
index 1636a40..138bb9b 100644
--- a/pytomoatt/checkerboard.py
+++ b/pytomoatt/checkerboard.py
@@ -1,21 +1,31 @@
 import h5py
 import numpy as np
 from .utils.common import init_axis, sind, cosd
+from .para import ATTPara
 import copy
 
 
 class Checker():
     """Create checkerboard model by adding perturbations on an exist model
     """
-    def __init__(self, fname:str) -> None:
-        self.model_file = fname
-        with h5py.File(fname) as f:
+    def __init__(self, model_fname:str, para_fname='input_params.yml') -> None:
+        """Initialize Checker object
+        
+        :param fname: Path to initial model file
+        :type fname: str
+        :param para_fname: Path to parameter file, defaults to 'input_params.yml'
+        :type para_fname: str, optional
+        """
+        self.model_file = model_fname
+        self.para_fname = para_fname
+        with h5py.File(model_fname) as f:
             self.vel = f['vel'][:]
             self.eta = f['eta'][:]
             self.xi = f['xi'][:]
             self.zeta = f['zeta'][:]
+        self._init_axis()
 
-    def init_axis(self, min_max_dep, min_max_lat, min_max_lon, n_rtp):
+    def _init_axis(self):
         """Initialize axis
 
         :param min_max_dep: min and max depth, ``[min_dep, max_dep]``
@@ -27,6 +37,11 @@ def init_axis(self, min_max_dep, min_max_lat, min_max_lon, n_rtp):
         :param n_rtp: number of dimensions [ndep, nlat, nlon]
         :type n_rtp: list
         """
+        para = ATTPara(self.para_fname)
+        n_rtp = para.input_params['domain']['n_rtp']
+        min_max_dep = para.input_params['domain']['min_max_dep']
+        min_max_lat = para.input_params['domain']['min_max_lat']
+        min_max_lon = para.input_params['domain']['min_max_lon']
         self.dd, self.tt, self.pp, self.dr, self.dt, self.dp, = init_axis(
             min_max_dep, min_max_lat, min_max_lon, n_rtp
         )
diff --git a/test/test_create_model.py b/test/test_create_model.py
index d2ceaef..bf6bcef 100644
--- a/test/test_create_model.py
+++ b/test/test_create_model.py
@@ -13,25 +13,11 @@ def test_crust(self):
         self.mod.write(self.out_fname)
 
     def test_checkerboard01(self):
-        para = ATTPara(self.para_fname)
-        cm = Checker(self.out_fname)
-        cm.init_axis(
-            para.input_params['domain']['min_max_dep'],
-            para.input_params['domain']['min_max_lat'],
-            para.input_params['domain']['min_max_lon'],
-            para.input_params['domain']['n_rtp']
-        )
+        cm = Checker(self.out_fname, self.para_fname)
         cm.checkerboard(2,2,2)
 
     def test_checkerboard02(self):
-        para = ATTPara(self.para_fname)
-        cm = Checker(self.out_fname)
-        cm.init_axis(
-            para.input_params['domain']['min_max_dep'],
-            para.input_params['domain']['min_max_lat'],
-            para.input_params['domain']['min_max_lon'],
-            para.input_params['domain']['n_rtp']
-        )
+        cm = Checker(self.out_fname, self.para_fname)
         cm.checkerboard(
             3,3,3,
             lim_x=[-1, 1],
@@ -39,6 +25,16 @@ def test_checkerboard02(self):
             lim_z=[10, 120]
         )
 
+    def test_checkerboard03(self):
+        cm = Checker(self.out_fname, self.para_fname)
+        cm.checkerboard(
+            4,4,4,
+            ani_dir=70,
+            lim_x=[-1, 1],
+            lim_y=[-0.5, 0.5],
+            lim_z=[10, 120]
+        )
+
     def test_read_model(self):
         mod = ATTModel.read(self.out_fname, para_fname=self.para_fname)
         dataset = mod.to_xarray()