diff --git a/input/user_input.py b/input/user_input.py
index 0dc91f1..7f0bace 100644
--- a/input/user_input.py
+++ b/input/user_input.py
@@ -1,54 +1,82 @@
 from input.natural_constants import *
 
-# BALLOON DATA
-m_pl = 917  #2174       # payload mass in [kg] (incl. flight-chain)
-m_bal_init = 540  #500  # initial ballast mass in [kg]
-m_film = 0.74074232733 * 1838     # mass balloon film in [kg]
-FreeLift = 10     # (initial) free lift in [%]
+m_pl = 2747           # payload mass in [kg] (incl. flight-chain)
+m_bal_init = 0        # initial ballast mass in [kg]
+m_film = 1883.77      # mass of balloon film in [kg]
+FreeLift = 10         # (initial) free lift in [%]
+V_design = 1120497.6  # (max.) balloon design volume in [m^3]
+
+start_height = -25.9254                # start altitude in [m]
+start_lat = -77.8535                   # start latitude in [deg]
+start_lon = 167.2022                   # start longitude in [deg]
+start_utc = '2019-12-15 13:56:00.000'  # start date and time in UTC
+simple = False                         # simple mode (no use of ERA5 radiation data)
 
 c_virt = 0.37
 
+t_sim = 25000  #1000000  # simulated flight duration in [s]
+
+drag_model = 'Palumbo'  # 'PalumboLow'  # 'PalumboHigh'  # 'Sphere_Re'
+
+#ERA5_ascent = ['ERA5/ascent.nc']                            # list of all ERA5 atmospheric data for ASCENT
+#ERA5_float = ['ERA5/float1.nc', 'ERA5/float2.nc']           # list of all ERA5 atmospheric data for FLOAT
+#ERA5_single = ['ERA5/radiation1.nc', 'ERA5/radiation2.nc']  # list of all ERA5 RADIATION data
+
+ERA5_ascent = 'ERA5/ASCENT_McMurdo_2019_12.nc'                            # list of all ERA5 atmospheric data for ASCENT
+ERA5_float = 'ERA5/FLOAT_McMurdo_2019_12to2020_1.nc'           # list of all ERA5 atmospheric data for FLOAT
+ERA5_single = 'ERA5/SINGLE_McMurdo_2019_12to2020_1.nc'  # list of all ERA5 RADIATION data
+
+
+# BALLOON DATA STUDIO
+#m_pl = 917
+#m_bal_init = 540
+#m_film = 0.74074232733 * 1838  # scaled down proportional to volume decrease between Raven 39.57 and 29.47
+#FreeLift = 10
+#V_design = 834497.469
+
+
+
+
 # SIMULATION
 
-start_height = 384.9                       # start altitude in [m]
-start_lat = 67.887382                      # start latitude in [deg]
-start_lon = 21.081452                      # start longitude in [deg]
-start_utc_old = '2016-07-12 03:17:24.000'  # start date and time in UTC
-start_utc = '2019-06-19 03:17:24.000'      # start date and time in UTC
-# possible start dates: between May 22 and June 22
-simple = True
+# start_lat = 78.22 Svalbard
+# start_lon = 15.65
+
 
 # ONLY IN CASE OF APPLICATION OF SIMPLE MODEL:
 epsilon_ground = 0.95  # ground emissivity
 T_ground = 288.15      # ground temperature
 Albedo = 0.3           # total albedo
-##cc = 0.1               # cloud cover
+cc = 0                 # cloud cover
+c_d = 0.47  # drag coefficient balloon (spherical) [-]  # 0.8
 
 m_gas_init = ((m_pl + m_film + m_bal_init) * (FreeLift/100 + 1))/(R_gas/R_air - 1)  # lifting gas mass in [kg]
 
-print("initial gas mass:")
-print(m_gas_init)
+print("Reading balloon data...")
+print("")
+print("Calculated initial gas mass based on free lift input:")
+print('{:.5}'.format(m_gas_init)+' kg')
 
-#GROSSER BALLON
+# GROSSER BALLON
 #V_design = 1120497.6  # maximum fillable balloon volume in [m^3]
 #L_goreDesign = 1.914 * V_design ** (1/3)
 #c_ducts = 0.62
-#c_valve = 0.77   # estimated
-#A_ducts = 76.54  # estimated
-#A_valve = 0.140
+c_valve = 0.77   # estimated
+A_ducts = 76.54  # estimated
+A_valve = 0.140
 #t_open = 20                 # time it takes to open vents in [s]
 #t_close = 20                # time it takes to open vents in [s]
 #m_baldot = m_bal_init/1375  # ballast mass drop rate in [kg/s]
 
 # kleiner Ballon
-V_design = 834497.469  # maximum fillable balloon volume in [m^3]
+
 L_goreDesign = 1.914 * V_design ** (1/3)
 c_ducts = 0.62
-c_valve = 0.72   # estimated
-A_ducts = 55.743  # estimated
-A_valve = 0.1297
+#c_valve = 0.72    # estimated for STUDIO balloon
+#A_ducts = 55.743  # estimated for STUDIO balloon
+#A_valve = 0.1297
 t_open = 20                 # time it takes to open vents in [s]
-t_close = 20                # time it takes to open vents in [s]
+t_close = 20                # time it takes to close vents in [s]
 m_baldot = m_bal_init/1375  # ballast mass drop rate in [kg/s]
 
 
@@ -64,8 +92,4 @@ r_IR = 0.040
 c_f = 2092  # [J/(kg*K)] specific heat balloon film
 
 
-# DRAG
-# c_d = 0.47  # drag coefficient balloon (spherical) [-]
-
-