diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ed8ebf5
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+__pycache__
\ No newline at end of file
diff --git a/Metrica_IO.py b/Metrica_IO.py
index 65ae83e..2c0b63a 100644
--- a/Metrica_IO.py
+++ b/Metrica_IO.py
@@ -85,7 +85,7 @@ def to_single_playing_direction(home,away,events):
     Flip coordinates in second half so that each team always shoots in the same direction through the match.
     '''
     for team in [home,away,events]:
-        second_half_idx = team.Period.idxmax(2)
+        second_half_idx = team.Period.idxmax(axis=0)
         columns = [c for c in team.columns if c[-1].lower() in ['x','y']]
         team.loc[second_half_idx:,columns] *= -1
     return home,away,events
@@ -103,6 +103,6 @@ def find_goalkeeper(team):
     Find the goalkeeper in team, identifying him/her as the player closest to goal at kick off
     ''' 
     x_columns = [c for c in team.columns if c[-2:].lower()=='_x' and c[:4] in ['Home','Away']]
-    GK_col = team.iloc[0][x_columns].abs().idxmax(axis=1)
+    GK_col = team.iloc[0][x_columns].abs().idxmax(axis=0)
     return GK_col.split('_')[1]
     
\ No newline at end of file
diff --git a/Metrica_Velocities.py b/Metrica_Velocities.py
index 465f9a8..795386b 100644
--- a/Metrica_Velocities.py
+++ b/Metrica_Velocities.py
@@ -42,7 +42,7 @@ def calc_player_velocities(team, smoothing=True, filter_='Savitzky-Golay', windo
     dt = team['Time [s]'].diff()
     
     # index of first frame in second half
-    second_half_idx = team.Period.idxmax(2)
+    second_half_idx = team.Period.idxmax(0)
     
     # estimate velocities for players in team
     for player in player_ids: # cycle through players individually
diff --git a/Metrica_Viz.py b/Metrica_Viz.py
index f2a6c2f..96513dc 100644
--- a/Metrica_Viz.py
+++ b/Metrica_Viz.py
@@ -138,7 +138,7 @@ def plot_frame( hometeam, awayteam, figax=None, team_colors=('r','b'), field_dim
     for team,color in zip( [hometeam,awayteam], team_colors) :
         x_columns = [c for c in team.keys() if c[-2:].lower()=='_x' and c!='ball_x'] # column header for player x positions
         y_columns = [c for c in team.keys() if c[-2:].lower()=='_y' and c!='ball_y'] # column header for player y positions
-        ax.plot( team[x_columns], team[y_columns], color+'o', MarkerSize=PlayerMarkerSize, alpha=PlayerAlpha ) # plot player positions
+        ax.plot( team[x_columns], team[y_columns], color+'o', markersize=PlayerMarkerSize, alpha=PlayerAlpha ) # plot player positions
         if include_player_velocities:
             vx_columns = ['{}_vx'.format(c[:-2]) for c in x_columns] # column header for player x positions
             vy_columns = ['{}_vy'.format(c[:-2]) for c in y_columns] # column header for player y positions
@@ -146,7 +146,7 @@ def plot_frame( hometeam, awayteam, figax=None, team_colors=('r','b'), field_dim
         if annotate:
             [ ax.text( team[x]+0.5, team[y]+0.5, x.split('_')[1], fontsize=10, color=color  ) for x,y in zip(x_columns,y_columns) if not ( np.isnan(team[x]) or np.isnan(team[y]) ) ] 
     # plot ball
-    ax.plot( hometeam['ball_x'], hometeam['ball_y'], 'ko', MarkerSize=6, alpha=1.0, LineWidth=0)
+    ax.plot( hometeam['ball_x'], hometeam['ball_y'], 'ko', markersize=6, alpha=1.0, linewidth=0)
     return fig,ax
     
 def save_match_clip(hometeam,awayteam, fpath, fname='clip_test', figax=None, frames_per_second=25, team_colors=('r','b'), field_dimen = (106.0,68.0), include_player_velocities=False, PlayerMarkerSize=10, PlayerAlpha=0.7):
@@ -196,7 +196,7 @@ def save_match_clip(hometeam,awayteam, fpath, fname='clip_test', figax=None, fra
             for team,color in zip( [hometeam.loc[i],awayteam.loc[i]], team_colors) :
                 x_columns = [c for c in team.keys() if c[-2:].lower()=='_x' and c!='ball_x'] # column header for player x positions
                 y_columns = [c for c in team.keys() if c[-2:].lower()=='_y' and c!='ball_y'] # column header for player y positions
-                objs, = ax.plot( team[x_columns], team[y_columns], color+'o', MarkerSize=PlayerMarkerSize, alpha=PlayerAlpha ) # plot player positions
+                objs, = ax.plot( team[x_columns], team[y_columns], color+'o', markersize=PlayerMarkerSize, alpha=PlayerAlpha ) # plot player positions
                 figobjs.append(objs)
                 if include_player_velocities:
                     vx_columns = ['{}_vx'.format(c[:-2]) for c in x_columns] # column header for player x positions
@@ -204,7 +204,7 @@ def save_match_clip(hometeam,awayteam, fpath, fname='clip_test', figax=None, fra
                     objs = ax.quiver( team[x_columns], team[y_columns], team[vx_columns], team[vy_columns], color=color, scale_units='inches', scale=10.,width=0.0015,headlength=5,headwidth=3,alpha=PlayerAlpha)
                     figobjs.append(objs)
             # plot ball
-            objs, = ax.plot( team['ball_x'], team['ball_y'], 'ko', MarkerSize=6, alpha=1.0, LineWidth=0)
+            objs, = ax.plot( team['ball_x'], team['ball_y'], 'ko', markersize=6, alpha=1.0, linewidth=0)
             figobjs.append(objs)
             # include match time at the top
             frame_minute =  int( team['Time [s]']/60. )