void plottdc(char *filename) {
FILE *fp =fopen(filename,"r");
if (fp) {
unsigned int hdr[10];
int nb = fread(hdr,sizeof(unsigned int), 5, fp);
int size = hdr[1]/sizeof(int);
printf("FILE %s opened\nheader read nb=%d\ndata size %d\n", filename, nb ,size);
//int *data = new unsigned int[size];
float *data = new float[size];
nb = fread(data, sizeof(float), size, fp);
printf("FILE data elements %d\n", nb);
fclose(fp);
TFile *f = new TFile(TString(filename)+".root","RECREATE");
TH1F *h = new TH1F("h","TDC;tdc(bin);N",size, -0.5, size-0.5);
for (int i=0; i< size; i++ ) h->SetBinContent(i+1,data[i]);
h->DrawCopy();
f->Write();
f->Close();
}
}