I figured it out:
java -jar /data1/jvarkit/dist/sam4weblogo.jar -r H19WT:1-174 SAMPLE_274_R1_val_1_bismark_bt2_pe-novosorted.bam
H19WT = chromosome / amplicon / reference name
1-174 = full length of amplicon
java -jar /data1/jvarkit/dist/sam4weblogo.jar -r H19WT:1-174 SAMPLE_274_R1_val_1_bismark_bt2_pe-novosorted.bam
H19WT = chromosome / amplicon / reference name
1-174 = full length of amplicon
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