diff --git a/src/scgenerator/physics/fiber.py b/src/scgenerator/physics/fiber.py
index d8b40b6..995cf92 100644
--- a/src/scgenerator/physics/fiber.py
+++ b/src/scgenerator/physics/fiber.py
@@ -657,7 +657,12 @@ def PCF_dispersion(lambda_, pitch, ratio_d, w0=None, n2=None, A_eff=None):
 
 
 def compute_loss(params: BareParams) -> Optional[np.ndarray]:
-    if params.loss == "capillary":
+    if params.loss_file is not None:
+        loss_data = np.load(params.loss_file)
+        wl = loss_data["wavelength"]
+        loss = loss_data["loss"]
+        return interp1d(wl, loss, fill_value=0, bounds_error=False)(params.l)
+    elif params.loss == "capillary":
         mask = params.l < params.upper_wavelength_interp_limit
         alpha = capillary_loss(params.l[mask], params.he_mode, params.core_radius)
         out = np.zeros_like(params.l)
diff --git a/src/scgenerator/physics/simulate.py b/src/scgenerator/physics/simulate.py
index c071627..2ac98bd 100644
--- a/src/scgenerator/physics/simulate.py
+++ b/src/scgenerator/physics/simulate.py
@@ -3,7 +3,7 @@ import os
 import random
 from datetime import datetime
 from pathlib import Path
-from typing import Dict, List, Tuple, Type
+from typing import Dict, List, Tuple, Type, Union
 
 import numpy as np
 
@@ -679,6 +679,15 @@ def run_simulation_sequence(
     method=None,
     prev_sim_dir: os.PathLike = None,
 ):
+    config_files = list(config_files)
+    if len(config_files) == 1:
+        while True:
+            conf = io.load_toml(config_files[0])
+            if (prev := conf.get("previous_config_file")) is not None:
+                config_files.insert(0, prev)
+            else:
+                break
+
     prev = prev_sim_dir
     for config_file in config_files:
         sim = new_simulation(config_file, prev, method)
@@ -694,12 +703,14 @@ def run_simulation_sequence(
 
 
 def new_simulation(
-    config_file: os.PathLike,
+    config: Union[dict, os.PathLike],
     prev_sim_dir=None,
     method: Type[Simulations] = None,
 ) -> Simulations:
-
-    config_dict = io.load_toml(config_file)
+    if isinstance(config, dict):
+        config_dict = config
+    else:
+        config_dict = io.load_toml(config)
     logger = get_logger(__name__)
 
     if prev_sim_dir is not None:
diff --git a/src/scgenerator/plotting.py b/src/scgenerator/plotting.py
index f3e3dec..4ca3d76 100644
--- a/src/scgenerator/plotting.py
+++ b/src/scgenerator/plotting.py
@@ -455,7 +455,7 @@ def plot_results_2D(
     plt_range: Union[units.PlotRange, tuple],
     params: BareParams,
     log: Union[int, float, bool, str] = "1D",
-    skip: int = 16,
+    skip: int = 1,
     vmin: float = None,
     vmax: float = None,
     transpose: bool = False,
diff --git a/src/scgenerator/utils/parameter.py b/src/scgenerator/utils/parameter.py
index 522ad82..8ee504c 100644
--- a/src/scgenerator/utils/parameter.py
+++ b/src/scgenerator/utils/parameter.py
@@ -315,12 +315,14 @@ class BareParams:
     # root
     name: str = Parameter(string)
     prev_data_dir: str = Parameter(string)
+    previous_config_file:str = Parameter(string)
 
     # # fiber
     input_transmission: float = Parameter(in_range_incl(0, 1))
     gamma: float = Parameter(non_negative(float, int))
     n2: float = Parameter(non_negative(float, int))
     loss: str = Parameter(literal("capillary"))
+    loss_file: str = Parameter(string)
     effective_mode_diameter: float = Parameter(positive(float, int))
     A_eff: float = Parameter(non_negative(float, int))
     pitch: float = Parameter(in_range_excl(0, 1e-3))
@@ -371,7 +373,7 @@ class BareParams:
     z_num: int = Parameter(positive(int))
     time_window: float = Parameter(positive(float, int))
     dt: float = Parameter(in_range_excl(0, 5e-15))
-    tolerated_error: float = Parameter(in_range_excl(1e-15, 1e-5))
+    tolerated_error: float = Parameter(in_range_excl(1e-15, 1e-3))
     step_size: float = Parameter(positive(float, int))
     lower_wavelength_interp_limit: float = Parameter(in_range_incl(100e-9, 3000e-9))
     upper_wavelength_interp_limit: float = Parameter(in_range_incl(200e-9, 5000e-9))