diff --git a/src/seismic_hazard_forecasting.py b/src/seismic_hazard_forecasting.py
index 0c48502..6f07d7c 100644
--- a/src/seismic_hazard_forecasting.py
+++ b/src/seismic_hazard_forecasting.py
@@ -48,7 +48,7 @@ def main(catalog_file, mc_file, pdf_file, m_file, m_select, mag_label, mc, m_max
     import logging
     from base_logger import getDefaultLogger
     from timeit import default_timer as timer
-    from math import ceil, floor
+    from math import ceil, floor, isnan
     import numpy as np
     import scipy
     import obspy
@@ -439,22 +439,39 @@ verbose: {verbose}")
 
         PGA = np.zeros(shape=(nx * ny))
 
-        # use dask parallel computing
         start = timer()
-        pbar = ProgressBar()
-        pbar.register()
-        # iter = range(0,len(distances))
-        iter = indices
-        iml_grid_raw = []  # raw ground motion grids
-        for imt in products:
-            logger.info(f"Estimating {imt}")
 
-            imls = [dask.delayed(compute_IMT_exceedance)(rx_lat[i], rx_lon[i], distances[i].flatten(), fr, p, lambdas,
-                                                         forecast_len, lambdas_perc, m_range, m_pdf, m_cdf, model,
-                                                         log_level=logging.DEBUG, imt=imt, IMT_min=0.0, IMT_max=2.0,
-                                                         rx_label=i) for i in iter]
-            iml = dask.compute(*imls)
-            iml_grid_raw.append(list(iml))
+        use_pp = False
+
+        if use_pp:         # use dask parallel computing
+            pbar = ProgressBar()
+            pbar.register()
+            # iter = range(0,len(distances))
+            iter = indices
+            iml_grid_raw = []  # raw ground motion grids
+            for imt in products:
+                logger.info(f"Estimating {imt}")
+
+                imls = [dask.delayed(compute_IMT_exceedance)(rx_lat[i], rx_lon[i], distances[i].flatten(), fr, p, lambdas,
+                                                            forecast_len, lambdas_perc, m_range, m_pdf, m_cdf, model,
+                                                            log_level=logging.DEBUG, imt=imt, IMT_min=0.0, IMT_max=2.0, rx_label=i,
+                                                            rtol=0.1, use_cython=False) for i in iter]
+                iml = dask.compute(*imls)
+                iml_grid_raw.append(list(iml))
+
+        else:
+            iml_grid_raw = []
+            iter = indices
+            for imt in products:
+                iml = []
+                for i in iter:
+                    iml_i = compute_IMT_exceedance(rx_lat[i], rx_lon[i], distances[i].flatten(), fr, p, lambdas, forecast_len, 
+                                                    lambdas_perc, m_range, m_pdf, m_cdf, model, imt=imt, IMT_min = 0.0,
+                                                    IMT_max = 2.0, rx_label = i, rtol = 0.1, use_cython=False)
+                    iml.append(iml_i)
+                    logger.info(f"Estimated {imt} at rx {i} is {iml_i}")
+                iml_grid_raw.append(iml)
+
         end = timer()
         logger.info(f"Ground motion exceedance computation time: {round(end - start, 1)} seconds")
 
@@ -486,6 +503,12 @@ verbose: {verbose}")
                                  mode='reflect', anti_aliasing=False)
             iml_grid_hd[iml_grid_hd == 0.0] = np.nan  # change zeroes back to nan
 
+            # trim edges so the grid is not so blocky
+            vmin_hd = min(x for x in iml_grid_hd.flatten() if not isnan(x))
+            vmax_hd = max(x for x in iml_grid_hd.flatten() if not isnan(x))
+            trim_thresh = vmin
+            iml_grid_hd[iml_grid_hd < trim_thresh] = np.nan
+
             # generate image overlay
             north, south = lat.max(), lat.min()  # Latitude range
             east, west = lon.max(), lon.min()  # Longitude range
@@ -494,8 +517,10 @@ verbose: {verbose}")
             map_center = [np.mean([north, south]), np.mean([east, west])]
 
             # Create an image from the grid
+            cmap_name = 'viridis'
+            cmap = plt.get_cmap(cmap_name)
             fig, ax = plt.subplots(figsize=(6, 6))
-            ax.imshow(iml_grid_hd, origin='lower', cmap='viridis')
+            ax.imshow(iml_grid_hd, origin='lower', cmap=cmap, vmin=vmin, vmax=vmax)
             ax.axis('off')
 
             # Save the figure
@@ -513,7 +538,6 @@ verbose: {verbose}")
             logger.info(f"Saved geographic bounds to SVG metadata (data-map-bounds): {overlay_filename} → {map_bounds}")
 
             # Make the color bar
-            cmap_name = 'viridis'
             width = 50
             height = 500
 
@@ -523,14 +547,14 @@ verbose: {verbose}")
 
             fig, ax = plt.subplots(figsize=((width + 40) / 100.0, (height + 20) / 100.0),
                                    dpi=100)  # Increase fig size for labels
-            ax.imshow(gradient, aspect='auto', cmap=plt.get_cmap(cmap_name),
-                      extent=[0, 1, vmin, vmax])  # Note: extent order is different for vertical
+            ax.imshow(gradient, aspect='auto', cmap=cmap.reversed(),
+                      extent=[0, 1, vmin, vmax_hd])  # Note: extent order is different for vertical
             ax.set_xticks([])  # Remove x-ticks for vertical colorbar
             num_ticks = 11  # Show more ticks
-            tick_positions = np.linspace(vmin, vmax, num_ticks)
+            tick_positions = np.linspace(vmin, vmax_hd, num_ticks)
             ax.set_yticks(tick_positions)
             ax.set_yticklabels([f"{tick:.2f}" for tick in tick_positions])  # format tick labels
-            ax.set_title(imt, pad=15)
+            ax.set_title(products[j], pad=15)
             fig.subplots_adjust(left=0.25, right=0.75, bottom=0.05, top=0.95)  # Adjust Layout
             fig.savefig("colorbar_" + str(j) + ".svg", bbox_inches='tight')
             plt.close(fig)