FUNCTION: THM_LSP_FIND_SPIKES NOT FOR GENERAL USE. CALLED BY THM_EFI_REMOVE_SPIKES ONLY FOR ISOLATED PARTICLE OR WAVE BURSTS NOT FOR ENTIRE ORBIT. PURPOSE: Remove the non-physical spiky signals in the efw data. INPUT: t -NEEDED. Time array xx -NEEDED. EFP data, DO NOT GIVE EFW DATA. Won't work. per -NEEDED. Spin period. KEYWORD: nwin -OPTIONAL. Number of points in spike search window. DFLT = 16 spikesig -OPTIONAL. Sigma of spikes. DFLT = 5 sigmin -OPTIONAL. Minimun of sigma. DFLT = 0 mV/m. OUTPUT: tpks RETURN VALUE. Time of peaks (mod spin per) + t0 Amp Estimated amplitude of spikes. Helps remove_spikes. HISTORY: 2009-05-30: REE. Broke out to run with wave burst.