diff --git a/simulations/airshower_beacon_simulation/lib/__init__.py b/simulations/airshower_beacon_simulation/lib/__init__.py
new file mode 100644
index 0000000..b2d03e1
--- /dev/null
+++ b/simulations/airshower_beacon_simulation/lib/__init__.py
@@ -0,0 +1,2 @@
+from .lib import *
+from . import rit
diff --git a/simulations/airshower_beacon_simulation/lib/rit.py b/simulations/airshower_beacon_simulation/lib/rit.py
new file mode 100644
index 0000000..9f06cd1
--- /dev/null
+++ b/simulations/airshower_beacon_simulation/lib/rit.py
@@ -0,0 +1,346 @@
+# from wappy import *
+from earsim import *
+from atmocal import *
+
+import matplotlib.pyplot as plt
+from scipy.signal import hilbert
+from scipy import signal
+from scipy.interpolate import interp1d
+from scipy.optimize import curve_fit,minimize
+import pandas as pd
+import os
+
+plt.rcParams.update({'font.size': 16})
+
+atm = AtmoCal()
+
+from matplotlib import cm
+
+def set_pol_and_bp(e,low=0.03,high=0.08):
+    for ant in e.antennas:
+        E = [np.dot(e.uAxB,[ex,ey,ez]) for ex,ey,ez in zip(ant.Ex,ant.Ey,ant.Ez)]
+        dt =  ant.t[1] -ant.t[0]
+        E = block_filter(E,dt,low,high)
+        ant.E_AxB = E
+        ant.t_AxB = ant.t
+
+
+def pow_and_time(test_loc,ev,dt=1.0):
+    t_ = []
+    a_ = []
+    t_min = 1e9
+    t_max = -1e9
+    for ant in ev.antennas:
+        #propagate to test location
+        aloc = [ant.x,ant.y,ant.z]
+        delta,dist = atm.light_travel_time(test_loc,aloc)
+        delta = delta*1e9
+        t__ = np.subtract(ant.t_AxB,delta)
+        t_.append(t__)
+        a_.append(ant.E_AxB)
+        if t__[0] < t_min:
+            t_min = t__[0]
+        if t__[-1] > t_max:
+            t_max = t__[-1]
+
+    t_sum = np.arange(t_min+1,t_max-1,dt)
+    a_sum = np.zeros(len(t_sum))
+    #interpolation
+    for t_r,E_ in zip (t_,a_):
+        f = interp1d(t_r,E_,assume_sorted=True,bounds_error=False,fill_value=0.)
+        a_int = f(t_sum)
+        a_sum = np.add(a_sum,a_int)
+    if len(a_sum) != 0:
+        P = np.sum(np.square(np.absolute(np.fft.fft(a_sum))))
+    else:
+        print("ERROR, a_sum lenght = 0",
+              "tmin ",t_min,
+              "t_max ",t_max,
+              "dt",dt)
+        P = 0
+    return P,t_,a_,a_sum,t_sum
+
+def shower_axis_slice(e,Xb=200,Xe=1200,dX=2,zgr=1400):
+    zgr = zgr + e.core[2]
+    N = int((Xe-Xb)/dX)
+    Xs = np.array(np.linspace(Xb,Xe,N+1))
+    ds = np.array([atm.distance_to_slant_depth(np.deg2rad(e.zenith),X,zgr) for X in Xs])
+
+    locs = []
+    for d_ in ds:
+        xc = np.sin(np.deg2rad(e.zenith))*np.cos(np.deg2rad(e.azimuth))* d_
+        yc = np.sin(np.deg2rad(e.zenith))*np.sin(np.deg2rad(e.azimuth))* d_
+        zc = np.cos(np.deg2rad(e.zenith))* d_
+        locs.append([xc,yc,zc])
+    p = []
+    for loc in locs:
+            P,t_,pulses_,wav,twav = pow_and_time(loc,e)
+            p.append(P)
+    p = np.asanyarray(p)
+    return ds,Xs,locs,p
+
+def shower_plane_slice(e,X=750.,Nx=10,Ny=10,wx=1e3,wy=1e3,xoff=0,yoff=0,zgr=1400):
+    zgr = zgr + e.core[2]
+    dX = atm.distance_to_slant_depth(np.deg2rad(e.zenith),X,zgr)
+    x = np.linspace(-wx,wx,Nx)
+    y = np.linspace(-wy,wy,Ny)
+    xx = []
+    yy = []
+    p = []
+    locs = []
+    for x_ in x:
+        for y_ in y:
+            loc = (x_+xoff)* e.uAxB + (y_+yoff)*e.uAxAxB + dX *e.uA
+            locs.append(loc)
+            P,t_,pulses_,wav,twav = pow_and_time(loc,e)
+            xx.append(x_+xoff)
+            yy.append(y_+yoff)
+            p.append(P)
+    xx = np.asarray(xx)
+    yy = np.asarray(yy)
+    p = np.asanyarray(p)
+    return xx,yy,p,locs[np.argmax(p)]
+
+def slice_figure(e,X,xx,yy,p,mode='horizontal'):
+    fig, axs = plt.subplots(1,figsize=(10,8))
+    fig.suptitle(r'E = %.1f EeV, $\theta$ = %.1f$^\circ$, $\phi$ = %.1f$^\circ$ X = %.f'%(e.energy,e.zenith,e.azimuth,X))
+    sc = axs.scatter(xx/1e3,yy/1e3,c=p,cmap='Spectral_r',alpha=0.6)
+    fig.colorbar(sc,ax=axs)
+    zgr = 1400 + e.core[2]
+    dX = atm.distance_to_slant_depth(np.deg2rad(e.zenith),X,zgr)
+    xc = np.sin(np.deg2rad(e.zenith))*np.cos(np.deg2rad(e.azimuth))* dX
+    yc = np.sin(np.deg2rad(e.zenith))*np.sin(np.deg2rad(e.azimuth))* dX
+    if mode == 'horizontal':
+        axs.plot(xc/1e3,yc/1e3,'r+',ms=30)
+        axs.set_xlabel('x (km)')
+        axs.set_ylabel('y (km)')
+    elif mode == "sp":
+        axs.plot(0,0,'r+',ms=30)
+        axs.set_xlabel('-v x B (km)')
+        axs.set_ylabel(' vxvxB (km)')
+    im = np.argmax(p)
+    axs.plot(xx[im]/1e3,yy[im]/1e3,'bx',ms=30)
+    fig.tight_layout()
+    return fig,axs
+
+def dist_to_line(xp,core,u):
+    xp = np.array(xp)
+    xp_core = xp-core
+    c2 = np.dot(xp_core,xp_core)
+    a2 = np.dot((np.dot(xp_core,u)*u),(np.dot(xp_core,u)*u))
+    d = (np.abs(c2 - a2))**0.5
+    return d
+
+def dist_to_line_sum(param,data,weights):
+    #distance line point: a = xp-core is D= | (a)^2-(a dot n)n  |
+    #where ux is direction of line and x0 is a point in the line (like t = 0)
+    x0 = param[0]
+    y0 = param[1]
+    theta = param[2]
+    phi = param[3]
+    core = np.array([x0, y0, 0.])
+    u = np.array([np.cos(phi)*np.sin(theta),np.sin(phi)*np.sin(theta),np.cos(theta)])
+    dsum = 0
+    for xp,w in zip(data,weights):
+        dsum += dist_to_line(xp,core,u)*w**2
+    # print('%.2e %.2e %.2e %.2e %.2e'%(x0,y0,theta,phi,dsum))
+    return dsum/len(data)
+
+def get_axis_points(e,savefig=True,path="",zgr=1400):
+    axis_points = []
+    max_vals = []
+    Xsteps = np.linspace(300,1000,15)
+    zgr=zgr+e.core[2] #not exact
+    dXref = atm.distance_to_slant_depth(np.deg2rad(e.zenith),750,zgr)
+    scale2d = dXref*np.tan(np.deg2rad(2.))
+    scale4d = dXref*np.tan(np.deg2rad(4.))
+    scale0_2d=dXref*np.tan(np.deg2rad(0.2))
+    for X in Xsteps:
+        print(X)
+        x,y,p,loc_max = shower_plane_slice(e,X,21,21,scale2d,scale2d)
+        if savefig:
+            fig,axs = slice_figure(e,X,x,y,p,'sp')
+            fig.savefig(path+'X%d_a.pdf'%(X))
+            plt.close(fig)
+        im = np.argmax(p)
+        if np.abs(x[im]) == np.max(x) or np.abs(y[im]) == (np.max(y)):
+            x,y,p,loc_max = shower_plane_slice(e,X,21,21,scale4d,scale4d)
+            if savefig:
+                fig,axs = slice_figure(e,X,x,y,p,'sp')
+                fig.savefig(path+'X%d_c.pdf'%(X))
+                plt.close(fig)
+        im = np.argmax(p)
+        x,y,p,loc_max = shower_plane_slice(e,X,21,21,scale0_2d,scale0_2d,x[im],y[im])
+        if savefig:
+            fig,axs = slice_figure(e,X,x,y,p,'sp')
+            fig.savefig(path+'X%d_b.pdf'%(X))
+            plt.close(fig)
+        max_vals.append(np.max(p))
+        axis_points.append(loc_max)
+
+    return Xsteps,axis_points,max_vals
+
+def fit_track(e,axis_points,vals,nscale=1e0):
+    weights = vals/np.max(vals)
+    data=axis_points[:]
+    data = [d/nscale for d in data] #km, to have more comparable step sizes
+    x0=[0,0,np.deg2rad(e.zenith),np.deg2rad(e.azimuth)]
+    res = minimize(dist_to_line_sum,args=(data,weights),x0=x0)
+    zen_r = np.rad2deg(res.x[2])
+    azi_r = np.rad2deg(res.x[3])
+    print(res,zen_r,e.zenith,azi_r,e.azimuth)
+    return zen_r,azi_r,[res.x[0]*nscale,res.x[1]*nscale,0]
+
+
+def update_event(e,core,theta,phi,axp=None):
+    #recalculate
+    e.zenith = theta
+    e.azimuth = phi
+    theta = np.deg2rad(theta)
+    phi = np.deg2rad(phi)
+    e.core = e.core+core
+    e.uA = np.array([np.cos(phi)*np.sin(theta),np.sin(phi)*np.sin(theta),np.cos(theta)])
+    e.uAxB = np.cross(e.uA,e.uB)
+    e.uAxB = e.uAxB/(np.dot(e.uAxB,e.uAxB))**0.5
+    e.uAxAxB = np.cross(e.uA,e.uAxB)
+    #antenna position
+    for a in e.antennas:
+        a.x -= core[0]
+        a.y -= core[1]
+        a.z -= core[2]
+    if axp != None:
+        for ap in axp:
+            ap[0] -= core[0]
+            ap[1] -= core[1]
+            ap[2] -= core[2]
+
+def longitudinal_figure(dist,Xs,p,mode='grammage'):
+    fig, axs = plt.subplots(1,figsize=(6,5))
+    if mode=='grammage':
+        axs.plot(Xs,p/np.max(p),'o-')
+        axs.set_xlabel('X (g/cm$^2$)')
+    if mode=='distance':
+        axs.plot(dist/1e3,p/np.max(p),'o-')
+        axs.set_xlabel('distance from ground (km)')
+    axs.grid()
+    fig.tight_layout()
+    return fig
+
+def time_residuals(e,tlable=True):
+    ds,tp,nsum,ssum,swidth,azi,x,y,sid = lateral_parameters(e,True,[0,0,0])
+    fig, axs = plt.subplots(1,figsize=(6,5),sharex=True)
+    tp = tp-np.min(tp)
+    cut_outlier = ~((ds<200)&(tp > 10))
+    axs.plot(ds,tp,'o')
+    if tlable:
+        for d,t,s in zip(ds,tp,sid):
+            plt.text(d,t,s)
+        # axs.text(ds,tp,sid)
+    axs.set_xlabel('distance (m)')
+    axs.set_ylabel('$\Delta t (ns)$')
+    axs.grid()
+    z = np.polyfit(ds[cut_outlier],tp[cut_outlier],3)
+    pfit = np.poly1d(z)
+    xfit = np.linspace(np.min(ds),np.max(ds),100)
+    yfit = pfit(xfit)
+    tres = tp - pfit(ds)
+    sigma =np.std(tres[cut_outlier])
+    axs.plot(xfit,yfit,label=r'pol3 fit, $\sigma=%.2f$ (ns)'%(sigma))
+    axs.legend()
+    fig.tight_layout()
+    return fig,tres
+
+def figure_3D(axis_points,max_vals,zen,azi,core,res = 0):
+    fig = plt.figure(figsize=(5,9))
+    # fig, axs = plt.subplots(1,2,figsize=(12,8))
+    ax = fig.add_subplot(2,1,1,projection='3d')
+    xp = [ap[0]/1e3 for ap in axis_points]
+    yp = [ap[1]/1e3 for ap in axis_points]
+    zp = [ap[2]/1e3 for ap in axis_points]
+    max_vals = np.asarray(max_vals)
+    ax.scatter(xp, yp, zp,c=max_vals,s=150*(max_vals/np.max(max_vals))**2,cmap='Spectral_r')
+    ax = fig.add_subplot(2,1,2)
+    core = np.array(core)
+    theta = np.deg2rad(zen)
+    phi = np.deg2rad(azi)
+    u = np.array([np.cos(phi)*np.sin(theta),np.sin(phi)*np.sin(theta),np.cos(theta)])
+    residuals = [dist_to_line(ap,core,u) for ap in axis_points]
+    dist = [np.sum((ap-core)**2)**0.5 for ap in axis_points]
+    ax.scatter(dist,residuals,c=max_vals,cmap='Spectral_r')
+    ax.grid()
+    # ax.plot(xl,yl,zl,'-')
+    # ax.set_zlim(0,18)
+    # ax.view_init(15, 10)
+    fig.tight_layout()
+    if res != 0:
+        res.track_dis.append(dist)
+        res.track_res.append(residuals)
+        res.track_val.append(max_vals)
+    return fig
+
+class RITResult():
+    """docstring for RITResult."""
+    def __init__(self):
+        super(RITResult, self).__init__()
+        self.xmax_rit = []
+        self.xmax = []
+        self.profile_rit = []
+        self.dX = []
+        self.dl = []
+        self.zenith_ini = []
+        self.azimuth_ini = []
+        self.core_ini = []
+        self.dcore_rec = []
+        self.zenith_rec = []
+        self.azimuth_rec = []
+        self.index = []
+        self.isMC = []
+        self.track_dis = []
+        self.track_res =[]
+        self.track_val =[]
+        self.station_ids =[]
+        self.station_x =[]
+        self.station_y =[]
+        self.station_z =[]
+        self.station_maxE = []
+        self.has_pulse = []
+
+def fill_stations_propeties(e,res):
+    x = np.array([a.x for a in e.antennas])
+    y = np.array([a.y for a in e.antennas])
+    z = np.array([a.z for a in e.antennas])
+    ids = [a.name for a in e.antennas]
+    maxE = np.array([np.max(a.E_AxB) for a in e.antennas])
+    has_pulse = np.array([np.max(a.has_pulse) for a in e.antennas])
+    res.station_x.append(x)
+    res.station_y.append(y)
+    res.station_z.append(z)
+    res.station_ids.append(ids)
+    res.has_pulse.append(has_pulse)
+
+def reconstruction(e,outfile=''):
+    res = RITResult()
+    res.isMC.append(True)
+    res.zenith_ini.append(e.zenith)
+    res.azimuth_ini.append(e.azimuth)
+    res.core_ini.append(e.core)
+
+    set_pol_and_bp(e)
+
+    #only use signal that have a signal in data
+    fill_stations_propeties(e,res)
+    Xs,axis_points,max_vals = get_axis_points(e,False)
+    zen,azi,core = fit_track(e,axis_points,max_vals,1e2)
+    fig = figure_3D(axis_points,max_vals,zen,azi,core,res)
+    fig.savefig(outfile)
+    update_event(e,core,zen,azi)
+    ds,Xs,locs,p = shower_axis_slice(e)
+    #result
+    res.dX.append(Xs)
+    res.dl.append(ds)
+    res.profile_rit.append(p)
+    res.xmax_rit.append(Xs[np.argmax(p)])
+    res.azimuth_rec.append(e.azimuth)
+    res.zenith_rec.append(e.zenith)
+    res.dcore_rec.append(core)
+    return res