cal: some line type changes in the plot of the filters

calibration/src/sphear_bf_plot_filters.m

@@ -30,11 +30,11 @@
 function sphear_bf_plot_filters(FC, W, X, Y, Z, S, T, U, V)
   fig = figure;
   %% color plot
-  popts = '.k';
+  popts = 'k.';
   wopts = 'k';
-  xopts = 'r';
-  yopts = 'b';
-  zopts = 'g';
+  xopts = 'r.-';
+  yopts = 'b.-';
+  zopts = 'g.-';
   copt = '-color';
   cext = "_color";
   grid on;