Support rad and deg NWA data

data.py

@@ -326,12 +326,13 @@ class NWAData(Trace):
     p_unit: str = 'a.u.'
     
     @classmethod
-    def from_file(cls, magfile, phasefile=None, unwrap=False, verbose=0):
+    def from_file(cls, magfile, phasefile=None, *, isdeg=True, unwrap=False, verbose=0):
         """Read in data from CSV file for magnitude and phase
         
         :param magfile: path to filename with magnitude trace data
         :param phasefile: path to filename with phase trace data. If None, phase data is assumed to be the second column in magfile.
         :param unwrap: if true, relative phase is unwraped to absolute phase centered around zero
+        :param isdeg: if phase data is in degree (True) or radians (False)
         """
         f, m, *other = np.loadtxt(magfile, skiprows=3, delimiter=',').T
         if phasefile is None:
@@ -342,8 +343,10 @@ class NWAData(Trace):
                 raise ValueError('Files provided do not have equal frequency components.')
         
         if unwrap:
+            if isdeg: p = np.deg2rad(p)
             p = np.unwrap(p)
             p -= np.mean(p)
+            if isdeg: p = np.rad2deg(p)
         
-        return NWAData(f, m, p)
+        return NWAData(f, m, p, p_unit='deg' if isdeg else 'rad')